Firefox version history

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This is the release history of Mozilla Firefox.

Current and future releases[edit]

Current supported official releases[edit]

Current supported test releases[edit]

Future official releases[edit]

Rapid
ESR
  • Firefox 52.3 ESR
  • Firefox 52.4 ESR
  • Firefox 52.5 ESR
  • Firefox 52.6 ESR
  • Firefox 52.7 ESR
  • Firefox 52.8 ESR

Future test releases[edit]

Release history[edit]

The tables below are in chronological order by release number, so the oldest still-supported versions and most recently available versions are found in the bottom table(s).

Early releases through version 4[edit]

Former release Former test release Former release – still supported Current supported official release Current supported test release Future official release Future test release Top

Release history
Browser name Gecko version Version Codename Release date[1] Release type and highlights[t 1]
Phoenix 1.2 0.1 Pescadero September 23, 2002 First release.[2]
  • Customizable toolbar
  • Quicksearch
0.2 Santa Cruz October 1, 2002 Official version 0.2 release.[3]
  • Web form auto-complete
  • Sidebar
    • Downloads Sidebar
    • Bookmarks Sidebar
    • History Sidebar
  • Extension management
  • Toolbar customization
  • Search bar
  • Improved preference defaults
  • Speed improvements
  • Ctrl+Mousewheel to resize fonts
0.3 Lucia October 14, 2002 Official version 0.3 release.[4]
  • Image Blocking
  • Pop-up Blocking Whitelist
  • Bookmarks Changes
  • Global Go Menu and Other Menu Changes
  • Tabbed Browsing Improvements
  • Size and Speed Improvements
1.3 0.4 Oceano October 19, 2002 Official version 0.4 release.[5]
  • Improvements to pop-up blocking
  • Improvements to toolbar customization
  • Improvements to tabbed browsing and shortcut keys
  • Type ahead find returns
  • Address bar gets smarter
  • Themes
0.5 Naples December 7, 2002 Official version 0.5 release.[6]
  • Multiple homepages
  • Intellimouse 5-button support
  • Sidebar remembers its state across sessions
  • Download fixes
  • History improvements
  • Accessibility improvements
  • Size and memory reduction
  • Performance improvements
  • Stability improvements
  • Better Windows appearance
  • Many more new themes
Firebird 1.5 0.6 Glendale May 17, 2003 Official version 0.6 release.[7]
  • New default theme (Qute)
  • Redesigned Preferences window
  • Improved Privacy Options
  • Improved Bookmarks
  • Talkback enabled to tell Mozilla why the browser crashed
  • Automatic Image Resizing
  • Smooth Scrolling
  • Access to more preferences through about:config
  • Custom profile save location
  • Mac OS X compatibility
0.6.1 July 28, 2003 Bugfix release.[8]
0.7 Indio October 15, 2003 Technology Preview.[9]
  • Advanced preferences panel
  • Download/helper apps preferences panel
  • Cookie whitelisting
  • New password manager (all passwords now stored encrypted[10])
  • Web panels (like Mozilla's sidebar panels)
  • Alternate stylesheet support (through a status bar button)
  • Send Page, Send Link, and Send Image menu items
  • Autoscroll
0.7.1 Three Kings October 26, 2003 Bugfix release for Mac OS X only.[11]
Firefox 1.6 0.8 Royal Oak February 9, 2004 Technology Preview.[12]
  • Rebranded with new logo.
  • Windows installer
  • Download Manager
  • New Add Bookmark Dialog
  • Work Offline
  • Better Handling of File Types
  • New XPInstall Frontend
  • New default theme for Mac OS X.
1.7 0.9 One Tree Hill June 15, 2004 Technology Preview.[13]
  • New default theme "Winstripe".
  • Comprehensive Data Migration from Internet Explorer.
  • Extension/Theme Manager
  • Online help system
  • Linux installer
0.9.1 June 28, 2004 Bugfix release
  • Updated default theme[14]
0.9.2 July 8, 2004 Vulnerability patch for Windows only.[14]
0.9.3 August 4, 2004 Vulnerability patch.[15]
0.10 Firefox 1.0
Preview Release
"Greenlane"
September 14, 2004 Bugs with higher complexity/risk, localization impact, RSS/Atom feed support, find toolbar, plugin finder.[16]
0.10.1 October 1, 2004 Vulnerability patch.[17]
Firefox 1 1.0 RC1 Firefox 1.0
Release Candidate 1
"Mission Bay"
October 27, 2004 First Firefox release candidate.
1.0 RC2 Firefox 1.0
Release Candidate 2
"Whangamata"
November 3, 2004 Second Firefox release candidate.
1.0 Firefox 1.0
"Phoenix"
November 9, 2004 Official version 1.0 release.[18]
  • Better Tabbed Browsing Controls
  • Official localized builds
1.0.1 Rose & Crown February 24, 2005 Regular security and stability update.[19]
1.0.2 March 23, 2005 Regular security and stability update.[20]
1.0.3 April 15, 2005 Regular security and stability update.
  • Installer improvements.[21]
1.0.4 May 11, 2005 Regular security and stability update.[22]
  • Fix to DHTML errors encountered at some web sites.
1.0.5 July 12, 2005 Regular security and stability update.[23]
1.0.6 July 19, 2005 Off-cycle stability update.[24]
  • Restored API compatibility for extensions and web applications that did not work in Firefox 1.0.5.
1.0.7 September 20, 2005 Regular security and stability update.[25]
1.0.8 April 13, 2006 Regular security and stability update.[26] End-of-life 1.0.x product line
Firefox 1.5 1.8 1.1a1 Deer Park Alpha 1
"Strippenkaart"
May 31, 2005 First Firefox 1.1 alpha release.
  • Support for SVG and canvas.
  • "Sanitize" privacy feature.
  • Improvements in JavaScript 1.5 and CSS 2/3.
  • Broken website reporter tool.[27]
1.1a2 Deer Park Alpha 2 July 12, 2005 Second Firefox 1.1 alpha release.
  • Blazing fast backwards and forwards (FastBack), drag-and-drop tab reordering, improved pop-up blocking, error pages instead of error dialogs.[28]
1.5b1 Firefox 1.5 Beta 1 September 9, 2005 First Firefox 1.5 beta release.
  • New update system (binary patch). Prettier error pages, more Luna-like Winstripe theme (did not blend well with the Classic theme).[29]
1.5b2 Firefox 1.5 Beta 2 October 6, 2005 Second Firefox 1.5 beta release.
  • Improvements to automated update system, website rendering and performance. Several security fixes.[30]
1.5 RC1 Firefox 1.5
Release Candidate 1
November 1, 2005 First Firefox 1.5 release candidate.
1.5 RC2 Firefox 1.5
Release Candidate 2
November 10, 2005 Second Firefox 1.5 release candidate.
1.5 RC3 Firefox 1.5
Release Candidate 3
November 17, 2005 Third Firefox 1.5 release candidate.
1.5 Firefox 1.5
"Deer Park"
November 29, 2005 Official version 1.5 release.[31]

Official localized builds.

1.5.0.1 February 1, 2006 Regular security and stability update.[32]
1.5.0.2 April 13, 2006 Regular security and stability update.[33]
  • Native support for Intel-based Macintosh computers by shipping universal binary.
1.5.0.3 May 2, 2006 Off-cycle security update.[34]
1.5.0.4 June 1, 2006 Regular security and stability update.[35]
1.5.0.5 July 26, 2006 Regular security and stability update.[36]
  • Added changes for Frisian locale (fy-NL).
1.5.0.6 August 2, 2006 Off-cycle security and stability update.[37]
  • Fixed an issue with playing Windows Media content introduced by previous update.
1.5.0.7 September 14, 2006 Regular security and stability update.[38]
1.5.0.8 November 7, 2006 Regular security and stability update.[39]
1.5.0.9 December 19, 2006 Regular security and stability update.[40]
1.5.0.10 February 23, 2007 Regular security and stability update.[41]
1.5.0.11 March 20, 2007 Regular security and stability update. Regression fixes.[42]
1.5.0.12 May 30, 2007 Regular security and stability update. [43] End-of-life 1.5.0.x product line

Last release for Windows 95

Firefox 2 1.8.1 2.0a1 Bon Echo Alpha 1 March 22, 2006 First Firefox 2.0 alpha release.[44]
2.0a2 Bon Echo Alpha 2 May 12, 2006 Second Firefox 2.0 alpha release.
  • Links default to open in new tab.
  • Close button on every tab.
  • Inline spell checking for text boxes.
  • Session restoration after browser crash.
  • Search suggestion for Google and Yahoo!.
  • New search plugin manager and add-on manager.
  • Web feed previewing.
  • Bookmark microsummaries.
  • Updates to extension system. Support for Sherlock and OpenSearch.
  • Support for SVG text using svg:textPath.[45]
2.0a3 Bon Echo Alpha 3 May 26, 2006 Third Firefox 2.0 alpha release. Anti-phishing protection. Search suggestions appear with search history in the search box for Google and Yahoo!. Support for client-side session and persistent storage.[46]
2.0b1 Firefox 2.0 Beta 1 July 12, 2006 First Firefox 2.0 beta release. Improved feed support. New NSIS-based installer. JavaScript 1.7. Enhanced security and localization support for extensions.[47]
2.0b2 Firefox 2.0 Beta 2 August 31, 2006 Second Firefox 2.0 beta release. New Winstripe theme refresh: new navigation icons, URL bar refresh (new Go button attached to the URL bar), Search bar refresh, Tab bar refresh, Alltabs button (used to view a popup list of all tabs open).[48]
2.0 RC1 Firefox 2.0
Release Candidate 1
September 26, 2006 First Firefox 2.0 release candidate.[49]
2.0 RC2 Firefox 2.0
Release Candidate 2
October 6, 2006 Second Firefox 2.0 release candidate.[50]
2.0 RC3 Firefox 2.0
Release Candidate 3
October 16, 2006 Third Firefox 2.0 release candidate.[51]
2.0 Firefox 2.0
"Bon Echo"
October 24, 2006 Official version 2.0 release[52]
  • Official localized builds.
  • Visual Refresh of main theme
  • Built-in phishing protection
  • Enhanced search capabilities
  • Improved tabbed browsing
  • Resuming your browsing session (session restore)
  • Previewing and subscribing to Web feeds
  • Inline spell checking
  • Live Web Titles
  • Improved Add-ons manager
  • JavaScript 1.7
  • Extended search plugin format (predictive search)
  • Improved security with extension system
  • Client-side session and persistent storage
  • SVG text support
  • New Windows installer
2.0.0.1 December 19, 2006 Regular security and stability update.[53]
2.0.0.2 February 23, 2007 Regular security and stability update.[54]
2.0.0.3 March 20, 2007 Regular security and stability update. Regression fixes and security fixes.[55]
2.0.0.4 May 30, 2007 Regular security and stability update.[56]
2.0.0.5 July 17, 2007 Security and stability update.[57]
2.0.0.6 July 30, 2007 Regular security and stability update.[58]
2.0.0.7 September 18, 2007 Off-cycle security update.[59]
2.0.0.8 October 18, 2007 Regular security and stability update. Mac OS X 10.5 support.[60]
2.0.0.9 November 1, 2007 Off-cycle security and stability update.[61]
2.0.0.10 November 26, 2007 Off-cycle security and stability update.[62]
2.0.0.11 November 30, 2007 Off-cycle stability update.[63]
2.0.0.12 February 7, 2008 Regular security and stability update.[64]
2.0.0.13 March 25, 2008 Regular security and stability update.[65]
2.0.0.14 April 16, 2008 Off-cycle stability update.[66]
2.0.0.15 July 1, 2008 Regular security and stability update.[67]
2.0.0.16 July 15, 2008 Off-cycle security update.[68]
2.0.0.17 September 23, 2008 Regular security and stability update.[69]
2.0.0.18 November 12, 2008 Regular security and stability update.[70]
2.0.0.19 December 16, 2008 Regular security and stability update.[71]
2.0.0.20 December 18, 2008 Off-cycle security update.[72]
  • Last release for Windows NT 4.0, 98, Me.
  • Bug fixes
  • Fixed security and stability issues.

End-of-life 2.0.0.x product line

Firefox 3 1.9 3.0a1 Gran Paradiso Alpha 1 December 8, 2006 First Firefox 3.0 alpha release. Cairo graphics library. Cocoa Widgets in OS X builds. Updated threading model. Changes to how DOM events are dispatched, how HTML object elements are loaded, and how web pages are painted. New SVG elements and filters, and improved SVG specification compliance. Windows 95, 98, ME and Mac OS X v10.2 no longer supported. Moving DOM nodes between documents require a call to importNode or adoptNode as per the DOM specification.[73]
3.0a2 Gran Paradiso Alpha 2 February 7, 2007 Second Firefox 3.0 alpha release. Reflow refactoring (leading to Acid2 test compliance) among numerous layout bug fixes. Web Apps 1.0 API for changing stylesheets support. Inline-block and inline-table values of CSS 2.1's display property implemented. XML documents can be rendered during download. Greatly improved Mac widgets support since Alpha 1. Improvements in Cairo graphics layer. Non-standard JavaScript "Script" object no longer supported.[74]
3.0a3 Gran Paradiso Alpha 3 March 23, 2007 Third Firefox 3.0 alpha release. Support for allowing web pages to store resources in the browser's offline cache. Support for Animated PNG images. Support for the "HTTPOnly" cookie extension which provides enhanced cookie privacy (also backported to Firefox 2.0.0.5). Improvements to layout and scaling precision across numerous screen and printer resolutions.[75]
3.0a4 Gran Paradiso Alpha 4 April 27, 2007 Fourth Firefox 3.0 alpha release. Adding of FUEL JavaScript library for extension developers. Rewrite of Page Info dialog. Upgrade to Cairo 1.4.2. More Cocoa regression fixes.[76]
3.0a5 Gran Paradiso Alpha 5 June 6, 2007 Fifth Firefox 3.0 alpha release. Places (bookmark and history service based on SQLite) used by default, but no front-end changes. Breakpad used as crash reporter on Windows and Mac OS X, superseding closed-source Talkback. Password manager rewrite. Support for Growl and native widgets within forms for Mac OS X.[77]
3.0a6 Gran Paradiso Alpha 6 July 2, 2007 Sixth Firefox 3.0 alpha release. Upgrade of SQLite to version 3.3.17, leading to increased cookie performance due to transition of cookie service to SQLite. Site-specific preference service, used initially for text zoom, allowing zoom setting to remain on each website. Support for native widgets within forms for Linux. New Quit dialog handles multiple windows more elegantly and allows users to save session. Autoscroll rewrite: numerous bug fixes and significant performance gain. Fixes to the use of units within the download manager. Various Places bug fixes.[78]
3.0a7 Gran Paradiso Alpha 7 August 3, 2007 Seventh Firefox 3.0 alpha release. More APIs implemented from WHATWG specs, such as ability to read files from file selection fields without need to upload and cut/copy/paste events, and cross-site XMLHttpRequest. New protocol-handling dialog. Experimental full-page zoom support, but no UI to control it. Numerous Mac OS X bug fixes, but Mac OS X 10.3 no longer supported for Gecko 1.9. General bug fixes.[79]
3.0a8 Gran Paradiso Alpha 8 September 20, 2007 Eighth Firefox 3.0 alpha release. New, basic UI for tagging bookmarks. Remember password prompt changed to non-modal information bar. Malware blacklist support. New UI for FTP and File protocol listings. Applications pane added to preferences. Basic support for web-based protocol handlers.[80]
3.0b1 Firefox 3.0 Beta 1 November 19, 2007 First Firefox 3.0 beta release.[81]
3.0b2 Firefox 3.0 Beta 2 December 18, 2007 Second Firefox 3.0 beta release. New UI improvements, including redesigned location bar, Places Organizer, Smart Bookmarks. Various stability and performance improvements.[82]
3.0b3 Firefox 3.0 Beta 3 February 12, 2008 Third Firefox 3.0 beta release. New UI improvements, including redesigned buttons and location bar. Different default native themes for each operating system. Upgraded to SQLite 3.5.4. Various stability and performance improvements.[83]
3.0b4 Firefox 3.0 Beta 4 March 10, 2008 Fourth Firefox 3.0 beta release. New UI improvement, including improved default themes for different operating systems. Various improvements in speed and resource usage.[84]
3.0b5 Firefox 3.0 Beta 5 April 2, 2008 Fifth Firefox 3.0 beta release. Further improved themes to match various operating systems, JavaScript engine optimizations for speed, improved Places organizer.[85]
3.0 RC1 Firefox 3.0
Release Candidate 1
May 16, 2008 First Firefox 3.0 release candidate.[86]
3.0 RC2 Firefox 3.0
Release Candidate 2
June 5, 2008 Second Firefox 3.0 release candidate.[87]
3.0 RC3 Firefox 3.0
Release Candidate 3
June 11, 2008 Third Firefox 3.0 release candidate.[88]
3.0 Firefox 3.0
"Gran Paradiso"
June 17, 2008 Official version 3.0 release.[89]
  • One-click site info
  • Malware Protection
  • New Web Forgery Protection page
  • New SSL error pages
  • Add-ons and Plugin version check
  • Secure add-on updates
  • Anti-virus integration with download manager
  • Vista Parental Controls
  • Effective top-level domain (eTLD) service better restricts cookies and other restricted content to a single domain.
  • Better protection against cross-site JSON data leaks.
  • Easier password management – save passwords after successful login
  • Simplified add-on installation from third party’s
  • New Download Manager
  • Resumable downloading after closing the browser
  • Full page zoom
  • Podcasts and Videocasts can be associated with your media playback tools
  • Tab scrolling and quickmenu
  • Save what you were doing – Firefox 3 will prompt users to save tabs on exit.
  • Optimized Open in Tabs behavior
  • Location and Search bar size can now be customized with a simple resizer item.
  • Text selection improvements (select multiple selections of text)
  • Find toolbar: the Find toolbar now opens with the current selection.
  • Plugin management with the add-on manager
  • Improved integration with Windows
  • Improved integration with the Mac
  • Integration with Linux GTK theme
  • Bookmark star button
  • Bookmark tags
  • Smart Location Bar
  • Library of bookmarks, history, etc.
  • Smart Bookmark Folders
  • Web-based protocol handlers for mail:to
  • Download & Install Add-ons from the Add-on manager
  • Easy to use Download Actions
  • New graphics and font handling in Gecko 1.9 provide rendering improvements in:
  • CSS
  • SVG
  • Display of fonts with ligatures and complex scripts
  • Color management of images with capabilities
  • Offline support for web applications
  • Improved speed
  • Reduced memory usage
  • Increased reliability
  • 25000 total code changes
  • Security fixes
  • Stability fixes
3.0.1 July 16, 2008 Security and stability update.[90]
3.0.2 September 23, 2008 Regular security and stability update.[91]
3.0.3 September 26, 2008 Bug fix for retrieving and saving passwords.[92]
3.0.4 November 12, 2008 Regular security and stability update.[93]
3.0.5 December 16, 2008 Regular security and stability update.[94]
3.0.6 February 3, 2009 Regular security and stability update.[95]
3.0.7 March 4, 2009 Regular security and stability update.[96]
3.0.8 March 27, 2009 Off-cycle security update.[97]
3.0.9 April 21, 2009 Regular security and stability update.[98]
3.0.10 April 27, 2009 Off-cycle stability update.[99]
3.0.11 June 11, 2009 Regular security and stability update.[100]
3.0.12 July 21, 2009 Regular security and stability update.[101]
3.0.13 August 3, 2009 Regular security and stability update.[102]
3.0.14 September 9, 2009 Regular security and stability update.[103]
3.0.15 October 27, 2009 Regular security and stability update.[104]
3.0.16 December 15, 2009 Regular security and stability update.[105]
3.0.17 January 5, 2010 Off-cycle stability update.[106]
3.0.18 February 17, 2010 Regular security and stability update.[107]
3.0.19 March 30, 2010 Regular security and stability update.[108]
  • Fixed several security and stability issues.

End-of-life 3.0.x product line

Firefox 3.5 1.9.1 3.1a1 Shiretoko Alpha 1 July 28, 2008 First Firefox 3.1 alpha release.[109]
  • Web standards improvements.
  • Text API for the <canvas> element.
  • Support for using border images.
  • Support for DOM query selectors.
  • Improvements to Smart Location Bar.
  • New tab-switching behavior.
3.1a2 Shiretoko Alpha 2 September 5, 2008 Second Firefox 3.1 alpha release.[110]
3.1b1 Firefox 3.1 Beta 1 October 14, 2008 First Firefox 3.1 beta release.
  • Web standards improvements in Gecko layout engine.
  • Added support for CSS 2.1 and CSS 3 properties.
  • New tab-switching shortcut that shows previews of the tab user is switching to.
  • Improved control over Smart Location Bar using special characters to restrict your search.
  • Support for new web technologies.[clarification needed][111]
3.1b2 Firefox 3.1 Beta 2 December 8, 2008 Second Firefox 3.1 beta release. Available in 54 languages. Added new Private Browsing Mode. Added functions to facilitate clearing recent history by time as well as to remove all traces of a website. New support for web worker threads. New TraceMonkey JavaScript engine on by default for web content. Improvements to Gecko layout engine, including speculative parsing for faster content rendering. Removed new tab-switching behavior based on user feedback. Support for new web technologies.[clarification needed][112]
3.1b3 Firefox 3.1 Beta 3 March 12, 2009 Third Firefox 3.1 beta release. [113]
  • Available in 64 languages.
  • Improved new Private Browsing Mode.
  • Improvements to web worker thread support.
  • Improved performance and stability with the TraceMonkey JavaScript engine.
  • New native JSON support.
  • Improvements to Gecko layout engine, including speculative parsing for faster content rendering.
  • Support for new web technologies such as <video> and <audio> elements, W3C Geolocation API, JavaScript query selectors, CSS 2.1 and 3 properties, SVG transforms and offline applications.
3.5b4 Firefox 3.5 Beta 4 April 27, 2009 First Firefox 3.5 beta release.[114]
  • Available in 70 languages.
  • Improved tools for controlling private data, including Private Browsing Mode.
  • Better performance and stability with new TraceMonkey JavaScript engine.
  • Ability to provide Location Aware Browsing using web standards for geolocation.
  • Support for native JSON, and web worker threads.
  • Improvements to Gecko layout engine, including speculative parsing for faster content rendering.
  • Support for new web technologies such as HTML5 <video> and <audio> elements, downloadable fonts and other new CSS properties, JavaScript query selectors, HTML5 offline data storage for applications, and SVG transforms.
3.5b99 Firefox 3.5 Preview June 8, 2009 Preview for Firefox 3.5, pre-release candidate.[115]
3.5 RC1 Firefox 3.5
Release Candidate 1
June 16, 2009 First Firefox 3.5 release candidate.[116]
3.5 RC2 Firefox 3.5
Release Candidate 2
June 19, 2009 Second Firefox 3.5 release candidate.[117]
3.5 RC3 Firefox 3.5
Release Candidate 3
June 24, 2009 Third Firefox 3.5 release candidate.[118]
3.5[119] Firefox 3.5
"Shiretoko"
June 30, 2009 Official version 3.5 release.
  • Support for the HTML5 <video> and <audio> elements including native support for Ogg Theora video and Vorbis audio
  • Improved tools for controlling your private data, including a Private Browsing Mode
  • Better web application performance using the new TraceMonkey JavaScript engine
  • The ability to share your location with websites using Location Aware Browsing
  • Support for native JSON, and web worker threads
  • Improvements to the Gecko layout engine, including speculative parsing for faster content rendering
  • Support for new web technologies such as:
    • Downloadable fonts
    • CSS media queries
    • New transformations and properties
    • JavaScript query selectors
    • HTML5 local storage and offline application storage
    • <canvas> text
    • ICC profiles
    • SVG transforms.
3.5.1 July 16, 2009 Off-cycle security and stability update.[120]
3.5.2 August 3, 2009 Regular security and stability update.[121]
3.5.3 September 9, 2009 Regular security and stability update.[122]
3.5.4 October 27, 2009 Regular security and stability update.[123]
3.5.5 November 5, 2009 Off-cycle security and stability update.[124]
3.5.6 December 15, 2009 Regular security and stability update.[125]
3.5.7 January 5, 2010 Off-cycle stability update.[126]
3.5.8 February 17, 2010 Regular security and stability update.[127]
3.5.9 March 30, 2010 Regular security and stability update.[128]
3.5.10 June 22, 2010 Regular security and stability update.[129]
3.5.11 July 20, 2010 Regular security and stability update.[130]
3.5.12 September 7, 2010 Regular security and stability update.[131]
3.5.13 September 15, 2010 Off-cycle stability update.[132]
3.5.14 October 19, 2010 Regular security and stability update.[133]
3.5.15 October 27, 2010 Off-cycle security update.[134]
3.5.16 December 9, 2010 Regular security and stability update.[135]
3.5.17 March 1, 2011 Regular security and stability update.[136]
3.5.18 March 22, 2011 Off-cycle security update.
  • Blacklists a few invalid HTTPS certificates.[137]
3.5.19 April 28, 2011 Regular security and stability update.
  • Fixed several security issues
  • Fixed several stability issues[138]

End-of-life 3.5.x product line

Firefox 3.6 1.9.2 3.6a1 Namoroka Alpha 1 August 7, 2009 First Firefox 3.6 alpha release.
  • Compositor (Phase 1), which moves Gecko to using one native widget per top-level content document.
  • A new focus model.
  • The chromedir attribute has been replaced with a pseudoclass.
  • Several new CSS3 properties including background size and gradients for background images.
  • Speed improvements to the TraceMonkey JavaScript engine.
  • Startup and responsiveness improvements throughout the application.[139]
3.6b1 Firefox 3.6 Beta 1 October 30, 2009 First Firefox 3.6 beta release. Users can now change their browser’s appearance with a single click, with built in support for Personas. Firefox 3.6 will alert users about out of date plugins to keep them safe. Open, native video can now be displayed full screen, and supports poster frames. Support for the WOFF font format. Improved JavaScript performance, overall browser responsiveness and startup time. Support for new CSS, DOM and HTML5 web technologies.[140]
3.6b2 Firefox 3.6 Beta 2 November 10, 2009 Second Firefox 3.6 beta release. A mechanism to prevent incompatible software from crashing Firefox.[141]
3.6b3 Firefox 3.6 Beta 3 November 17, 2009 Third Firefox 3.6 beta release. A change to how third-party software integrates with Firefox to increase stability. The ability to run scripts asynchronously to speed up page load times.[142]
3.6b4 Firefox 3.6 Beta 4 November 26, 2009 Fourth Firefox 3.6 beta release. Added support for the HTML5 File API.[143]
3.6b5 Firefox 3.6 Beta 5 December 17, 2009 Fifth Firefox 3.6 beta release.[144]
3.6 RC1 Firefox 3.6
Release Candidate 1
January 8, 2010 First Firefox 3.6 release candidate.[145]
3.6 RC2 Firefox 3.6
Release Candidate 2
January 17, 2010 Second Firefox 3.6 release candidate.[146]
3.6 Firefox 3.6
"Namoroka"
January 21, 2010 Official Firefox 3.6 release. [147]
  • Support for Persona themes
  • Protection from out-of-date plugins to keep users safer as they browse.
  • Open, native video can now be displayed full screen and supports poster frames.
  • Improved JavaScript performance, overall browser responsiveness, and startup time.
  • The ability for web developers to indicate that scripts should run asynchronously to speed up page load times.
  • Continued support for downloadable web fonts using the new WOFF font format.
  • Support for new CSS attributes such as gradients, background sizing, and pointer events.
  • Support for new DOM and HTML5 specifications including the Drag & Drop API and the File API, which allow for more interactive web pages.
  • Changes to how third-party software can integrate with Firefox in order to prevent crashes.
3.6.2[t 2] March 22, 2010 Security and stability update.[148]
3.6.3 April 1, 2010 Quick turn-around security update.[149]
3.6.3plugin1 Firefox 3.6.3plugin1
"Lorentz"
April 8, 2010 First Firefox "Lorentz" beta, followed by 7 more Firefox 3.6.4 pre-release builds, all codenamed "Lorentz".[150]
3.6.4 Firefox 3.6.4 (OOPP)
"Lorentz"
June 22, 2010 Regular security and stability update, including OOPP.[151]
3.6.6[t 3] June 26, 2010 Off-cycle stability update. Modified crash protection feature to increase amount of time plugins allowed to be non-responsive before being terminated.[152]
3.6.7 July 20, 2010 Regular security and stability update.[153]
3.6.8 July 23, 2010 Off-cycle stability update.[154]
3.6.9 September 7, 2010 Regular security and stability update. Also added support for X-FRAME-OPTIONS HTTP response header to help prevent clickjacking and removed option to enable experimental HTML5 parser via user preference html5.enable in about:config.[155]
3.6.10 September 15, 2010 Off-cycle stability update.[156]
3.6.11 October 19, 2010 Regular security and stability update.[157]
3.6.12 October 27, 2010 Off-cycle security update.[158]
3.6.13 December 9, 2010 Regular security and stability update.[159]
3.6.14 March 1, 2011 Regular security and stability update.[160]
3.6.15 March 4, 2011 Off-cycle stability update. Fixed issue where some Java applets failed to load in Firefox 3.6.14.[161]
3.6.16 March 22, 2011 Off-cycle security update. Blacklisted several invalid HTTPS certificates.[162]
3.6.17 April 28, 2011 Regular security and stability update.[163]
3.6.18 June 21, 2011 Regular security and stability update.[164]
3.6.19 July 11, 2011 Off-cycle stability update. Turned off downloadable font support for users running Mac OS X 10.7 due to an underlying platform bug. No changes made on Windows side.[165]
3.6.20 August 16, 2011 Regular security and stability update.[166]
3.6.21 August 30, 2011 Off-cycle security update. Blacklisted a compromised HTTPS certificate.[167]
3.6.22 September 6, 2011 Off-cycle security update.[168]
3.6.23 September 27, 2011 Regular security and stability update.[169]
3.6.24 November 8, 2011 Regular security and stability update.[170]
3.6.25 December 20, 2011 Regular security and stability update.[171]
3.6.26 January 31, 2012 Regular security and stability update.[172]
3.6.27 February 17, 2012 Off-cycle security update.[173]
3.6.28 March 13, 2012 Regular security and stability update.
  • Last release for Mac OS X Tiger and PowerPC Macs
  • Added Out-of-process plugins[174]
  • Fixed several security issues
  • Fixed several stability issues[175]

End-of-life 3.6.x product line on April 24, 2012.

Firefox 4 1.9.3 3.7a1 Mozilla Developer Preview 3.7 Alpha 1 February 10, 2010 First Firefox 3.7 alpha release. Support for WebGL(Disabled by default, but can be enabled by changing a preference). Support for new CSS, DOM and HTML5 web technologies.[176]
3.7a2 Mozilla Developer Preview 3.7 Alpha 2 March 3, 2010 Second Firefox 3.7 alpha release. On Windows and Linux, plugins (such as Flash and Silverlight) are now isolated from Firefox. Plugin crashes will not kill Firefox itself, and unresponsive plugins are automatically restarted. The SSL security system has been changed to fix a renegotiation flaw. Link history lookup is now performed asynchronously on a thread. Loading the HTML5 specification no longer causes very long browser pauses. Some JavaScript engine improvements. The stop and reload buttons have been merged when they are adjacent on the toolbar. More performance and stability improvements.[177]
3.7a3 Mozilla Developer Preview 3.7 Alpha 3 March 17, 2010 Third Firefox 3.7 alpha release. An experimental Direct2D rendering backend on Windows is available, turned off by default. Significant API improvements are available for JS-ctypes. Mozilla now uses an infallible allocator. Additional fixes for multi-process plugins.[178]
3.7a4 Mozilla Developer Preview 3.7 Alpha 4 April 12, 2010 Fourth Firefox 3.7 alpha release. CSS :visited selectors have been changed to block ways that websites can quickly check a user's browsing history. Currently loaded web pages are shown in the location bar autocomplete list, allowing switching to existing tabs. The beta version of Adobe Flash is now run in a separate process on Mac OS X Snow Leopard (10.6). Full-screen video on Windows is now rendered using hardware acceleration when available. Mozilla has implemented the Core Animation rendering model for plugins on Mac OS X. Linux builds are now built with -fomit-frame-pointer. Support for new SVG and HTML5 web technologies.[179]
3.7a4webm Mozilla Developer Preview 3.7 Alpha 4 WebM May 19, 2010 Added WebM video playback.
3.7a5 Mozilla Developer Preview 3.7 Alpha 5 June 14, 2010 Fifth Firefox 3.7 alpha release. First official release to include linux-x86_64 and mac-x86_64 builds and first regular release to include WebM video playback. New Addons Manager (placeholder UI only). Tab on Top can now be implemented. Firefox now uses hardware acceleration for video playback. Cocoa NPAPI support. ChromeWorker with jsctypes support. Lazy frame construction for faster dynamic pages. JavaScript performance improvements. Loading the URL about:memory now shows how much memory is used by different parts of Firefox. More Performance improvement and support for new CSS and HTML5 web technology.[180]
2.0 4.0b1 Firefox 4.0 Beta 1 July 6, 2010 First Firefox 4.0 beta release. Tabs are now on top by default on Windows. On Windows Vista and Windows 7 the menu bar has been replaced with the Firefox button. The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like). Support for more HTML5 technologies.[181]
4.0b2 Firefox 4.0 Beta 2 July 27, 2010 Second Firefox 4.0 beta release. Tabs are now on top by default on OSX. App Tabs can now be created. Content animation using CSS Transitions can now be implemented. Responsiveness and scrolling improvements from the new retained layers layout system. JavaScript speed improvements due to engine optimizations. Changes to how XPCOM components are registered in order to help startup time and process separation.[182]
4.0b3 Firefox 4.0 Beta 3 August 11, 2010 Third Firefox 4.0 beta release. Web authors can now get touch events from Firefox users on Windows 7 machines. A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code (used for things like graphics and animations) more efficiently.[183]
4.0b4 Firefox 4.0 Beta 4 August 24, 2010 Fourth Firefox 4.0 beta release. Firefox Sync is now included. Panorama, a new feature that gives users a visual overview of all open tabs, allowing them to be sorted and grouped, is now included. An experimental API is included to provide more efficient Javascript animations. Firefox now supports the HTML5 video "buffered" property.[184]
4.0b5 Firefox 4.0 Beta 5 September 7, 2010 Fifth Firefox 4.0 beta release. Support for the new proposed Audio Data API. Direct2D Hardware Acceleration is now on by default for Windows 7 users. Firefox button has a new look for Windows Vista and Windows 7 users. Support for HSTS security protocol allowing sites to insist that they only be loaded over SSL.[185]
4.0b6 Firefox 4.0 Beta 6 September 14, 2010 Sixth Firefox 4.0 beta release. Fixed a stability issue affecting Windows users. Fixed an issue causing rendering errors with plugins affecting Mac OS X users.[186]
4.0b7 Firefox 4.0 Beta 7 November 10, 2010 Seventh Firefox 4.0 beta release. Uses JägerMonkey, a new, faster JavaScript engine. WebGL is enabled by default on Windows and Mac OS X. Certain rendering operations are now hardware-accelerated using Direct3D 9 on Windows XP, Direct3D 10 on Windows Vista and 7, and OpenGL on Mac OS X. Improved web typography using OpenType with support for ligatures, kerning and font variants. HTML5 Forms API makes web based forms easier to implement and validate.[187]
4.0b8 Firefox 4.0 Beta 8 December 21, 2010 Eighth Firefox 4.0 beta release. The Firefox Sync setup experience has been greatly improved across desktop and mobile devices. Speed, functionality, and compatibility improvements to WebGL. Additional polish for the Firefox Add-ons Manager.[188]
4.0b9 Firefox 4.0 Beta 9 January 14, 2011 Ninth Firefox 4.0 beta release. Overhaul of the bookmarks and history code, enabling faster bookmarking and startup performance. Per-compartment garbage collection is now enabled, reducing work done during complex animations.[189]
4.0b10 Firefox 4.0 Beta 10 January 25, 2011 Tenth Firefox 4.0 beta release. Compatibility and stability improvements when using Adobe Flash on Mac OS X. Improvements in memory usage. Support for a graphics driver blacklist to improve stability.[190]
4.0b11 Firefox 4.0 Beta 11 February 8, 2011 Eleventh Firefox 4.0 beta release. Support for the proposed Do Not Track ("DNT") header. Connection status messages are now shown in a small overlay. WebGL has been re-enabled on Linux. The default homepage design has been refreshed. Firefox no longer switches into offline mode automatically.[191]
4.0b12 Firefox 4.0 Beta 12 February 25, 2011 Twelfth Firefox 4.0 beta release. Increased performance while viewing Flash content. Improved plugin compatibility with hardware acceleration enabled. Hovering over links now displays the URL at the bottom of the window rather than in the location bar. General stability, performance, and compatibility improvements.[192]
4.0 RC1 Firefox 4.0
Release Candidate 1
March 9, 2011 First Firefox 4.0 release candidate.[193]
  • General stability, performance, and compatibility improvements.
4.0 RC2 Firefox 4.0
Release Candidate 2
March 18, 2011 Second Firefox 4.0 release candidate.[194]
  • Blacklisted a few invalid HTTPS certificates.
  • Updated localizations for 29 locales.
  • Added Vietnamese localization, bringing the total languages available in Firefox 4 to 83.
4.0 Firefox 4.0
"Tumucumaque"
March 22, 2011 Official Firefox 4.0 release.[195]
  • Firefox 4 is available in over 80 languages
  • Uses JägerMonkey, a faster JavaScript engine
  • Support for Do Not Track ("DNT") header that allows users to opt out of behavioral advertising
  • Firefox Sync is included by default
  • Graphic rendering is now hardware-accelerated using Direct3D 9 (Windows XP), Direct3D 10 (Windows Vista & 7), and OpenGL on Mac OS
  • Direct2D Hardware Acceleration is now on by default for Windows 7 users
  • WebGL is enabled on all platforms that have a capable graphics card with updated drivers
  • Native support for the HD HTML5 WebM video format, hardware accelerated where available
  • Firefox button has a new look for Windows Vista and Windows 7 users
  • Tabs are now on top by default on Windows, Mac OS X, and Linux
  • You can search for and switch to already open tabs in the Smart Location Bar
  • The stop and reload buttons have been merged into a single button on Windows, Mac OS X, and Linux
  • The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like)
  • Crash protection when there is a crash in Adobe Flash Player, Apple QuickTime or Microsoft Silverlight plugins
  • You can turn any tab into an "App Tab"
  • The default homepage design has been refreshed
  • Overhaul of the bookmarks and history code, enabling faster bookmarking and startup performance
  • Per-compartment garbage collection is now enabled, reducing work done during complex animations
  • Additional polish for the Firefox add-on Manager
  • Improved web typography using OpenType with support for ligatures, kerning and font variants
  • Web developers can animate content using CSS Transitions
  • Responsiveness and scrolling improvements from the new retained layers layout system
  • HTML5 Forms API makes web based forms easier to implement and validate
  • Support for the new proposed Audio Data API
  • Support for HSTS security protocol allowing sites to insist that they only be loaded over SSL
  • A new feature called Panorama gives users a visual overview of all open tabs, allowing them to be sorted and grouped
  • An experimental API is included to provide more efficient JavaScript animations
  • Firefox now supports the HTML5 video "buffered" property
  • Changes to how XPCOM components are registered in order to help startup time and process separation
  • New Addons Manager and extension management API
  • Significant API improvements are available for JS-ctypes, a foreign function interface for extensions
  • CSS Transitions are partially supported
  • Core Animation rendering model for plugins on Mac OS X
  • Web developers can update the URL field without reloading the page using HTML History APIs
  • More responsive page rendering using lazy frame construction
  • Link history lookup is done asynchronously to provide better responsiveness during pageload
  • CSS :visited selectors have been changed to block websites from being able to check a user's browsing history
  • New HTML5 parser
  • Support for more HTML5 form controls
  • Web authors can now get touch events from Firefox users on Windows 7 machines
  • A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code more efficiently.
4.0.1 Firefox 4.0.1
"Macaw"
April 28, 2011 Regular security and stability update.[196]
  • Fixed several security issues
  • Fixed several stability issues

End-of-life 4.0.x product line

Rapid releases[edit]

Versions 5 through 9[edit]

From now on, Gecko version numbering is same as Firefox build version number, starting 5.0 on Firefox 5.

Former release Former test release Former release – still supported Current supported official release Current supported test release Future official release Future test release Top
Release history
Browser name Version Codename Release date[1] Release type and highlights[t 1]
Firefox 5 5.0a2 Firefox 5.0 Aurora April 13, 2011 First Firefox 5.0 Aurora build.[197][198]
5.0b1 Firefox 5.0 Beta 1 May 4, 2011 No official Firefox 5.0 beta release.
Renamed "Aurora 5.0 Alpha 2" build to test release channel switching for users on the Aurora-Channel.[199]
5.0b2 Firefox 5.0 Beta 2 May 20, 2011 First Firefox 5.0 Beta release.[200][201]
5.0b3 Firefox 5.0 Beta 3 June 1, 2011 Second Firefox 5.0 Beta release.
5.0b5[t 4] Firefox 5.0 Beta 5 June 9, 2011 Third Firefox 5.0 Beta release.
5.0b6 Firefox 5.0 Beta 6 June 14, 2011 Fourth Firefox 5.0 Beta release.
5.0b7 Firefox 5.0 Beta 7 June 15, 2011 Fifth Firefox 5.0 Beta release.
5.0 Firefox 5.0 June 21, 2011 Official Firefox 5.0 release.[202]
  • Better standards support for HTML5, CSS3, MathML, XHR and SMIL
  • Better visibility for the Do not track header preference[203]
  • Stability and security improvements[204][205][206]
  • Better tuned HTTP idle connection logic[203]
  • Improved canvas, JavaScript, memory, and networking performance
  • Improved spell checking for some locales
  • Improved desktop environment integration for Linux users
  • Better WebGL security (WebGL content can no longer load cross-domain textures).[207]
  • Background tabs have setTimeout and setInterval clamped to 1000 ms to improve performance[208]
  • Gecko version number bumped to 5.0 to match (and from then on stay synced to) Firefox's major version number[209]
  • Added support for CSS animations.
  • The Do-Not-Track header preference has been moved to increase discoverability.
  • Tuned HTTP idle connection logic for increased performance.
  • Improved canvas, JavaScript, memory, and networking performance.
  • Improved standards support for HTML5, XHR, MathML, SMIL, and canvas.
  • Improved spell checking for some locales.
  • Improved desktop environment integration for Linux users.
  • WebGL content can no longer load cross-domain textures.
  • Background tabs have setTimeout and setInterval clamped to 1000 ms to improve performance.
5.0.1 Firefox 5.0.1 July 11, 2011 Off-cycle stability update for Mac OS X only.
  • Fixed an issue in Mac OS X 10.7 that could cause Firefox to crash[210]
  • Fixed an issue caused by Apple's "Java for Mac OS X 10.6 Update 5" where the Java plugin would not be loaded[211]

End-of-life 5.0.x product line on August 16, 2011.

Firefox 6 6.0a1 Firefox 6.0 Nightly April 13, 2011 First Firefox 6.0 Nightly build.[197][212]
6.0a2 Firefox 6.0 Aurora May 25, 2011 First Firefox 6.0 Aurora build.[213][214]
6.0b1 Firefox 6.0 Beta 1 July 8, 2011 First Firefox 6.0 Beta release.[215][216]
6.0b2 Firefox 6.0 Beta 2 July 16, 2011 Second Firefox 6.0 Beta release.
6.0b3 Firefox 6.0 Beta 3 July 26, 2011 Third Firefox 6.0 Beta release.
6.0b4 Firefox 6.0 Beta 4 August 1, 2011 Fourth Firefox 6.0 Beta release.
6.0b5 Firefox 6.0 Beta 5 August 5, 2011 Fifth Firefox 6.0 Beta release.
6.0 Firefox 6.0 August 16, 2011 Official Firefox 6.0 release.[217]
  • about:permissions, a permissions manager. The user can choose what information can be shared with sites, e.g. location.
  • The address bar now highlights the domain of the website you're visiting.
  • Streamlined the look of the site identity block.
  • Added support for the latest draft version of WebSockets with a prefixed API.
  • Added support for EventSource / server-sent events.
  • Added support for window.matchMedia.
  • Added Scratchpad, an interactive JavaScript prototyping environment.
  • Added a new Web Developer menu item and moved development-related items into it.
  • Improved usability of the Web Console.
  • Improved the discoverability of Firefox Sync.
  • Reduced browser startup time when using Panorama.
  • Fixed several stability and security issues.
6.0.1 Firefox 6.0.1 August 30, 2011 Off-cycle security update.
  • Revoked the root certificate for DigiNotar due to fraudulent SSL certificate issuance.[218]
6.0.2 Firefox 6.0.2 September 6, 2011 Off-cycle security update.[219]
  • Removed trust exceptions for certificates issued by Staat der Nederlanden
  • Resolved an issue with gov.uk websites.

End-of-life 6.0.x product line on September 27, 2011.

Firefox 7 7.0a1 Firefox 7.0 Nightly May 25, 2011 First Firefox 7.0 Nightly build.[220]
7.0a2 Firefox 7.0 Aurora July 6, 2011 First Firefox 7.0 Aurora build.[221][222]
7.0b1 Firefox 7.0 Beta 1 August 18, 2011 First Firefox 7.0 Beta release.[223][224]
7.0b2 Firefox 7.0 Beta 2 August 26, 2011 Second Firefox 7.0 Beta release.
7.0b4 [t 5] Firefox 7.0 Beta 4 September 6, 2011 Third Firefox 7.0 Beta release.
7.0b5 Firefox 7.0 Beta 5 September 9, 2011 Fourth Firefox 7.0 Beta release.
7.0b6 Firefox 7.0 Beta 6 September 19, 2011 Fifth Firefox 7.0 Beta release.
7.0 Firefox 7.0 September 27, 2011 Official Firefox 7.0 release.[225]
  • Drastically improved memory handling for certain use cases.
  • Added a new rendering backend to speed up Canvas operations on Windows systems.
  • Bookmark and password changes now sync almost instantly when using Firefox Sync.
  • The http:// URL prefix is now hidden by default.
  • Added support for text-overflow: ellipsis.
  • Added support for the Web Timing specification.
  • Enhanced support for MathML.
  • The WebSocket protocol has been updated from version 7 to version 8.
  • Added an opt-in system for users to send performance data back to Mozilla to improve future versions of Firefox.
  • Fixed several security and stability issues.
7.0.1 Firefox 7.0.1 September 29, 2011 Off-cycle security and stability update.[226]
  • Fixed a rare issue where some users could find one or more of their add-ons hidden after a Firefox update.

End-of-life 7.0.x product line on November 8, 2011.

Firefox 8 8.0a1 Firefox 8.0 Nightly July 6, 2011 First Firefox 8.0 Nightly build.[227]
8.0a2 Firefox 8.0 Aurora August 19, 2011 First Firefox 8.0 Aurora build.[228][229]
8.0b1 Firefox 8.0 Beta 1 September 29, 2011 First Firefox 8.0 Beta release.[230][231]
8.0b2 Firefox 8.0 Beta 2 October 10, 2011 Second Firefox 8.0 Beta release.
8.0b3 Firefox 8.0 Beta 3 October 13, 2011 Third Firefox 8.0 Beta release.
8.0b4 Firefox 8.0 Beta 4 October 19, 2011 Fourth Firefox 8.0 Beta release.
8.0b5 Firefox 8.0 Beta 5 October 27, 2011 Fifth Firefox 8.0 Beta release.
  • Removed support for new tab animation due to incompatibilities with some extensions.
8.0b6 Firefox 8.0 Beta 6 November 1, 2011 Sixth Firefox 8.0 Beta release.
8.0 Firefox 8.0 November 8, 2011 Official Firefox 8.0 release.[232]
  • Add-ons installed by third-party programs are now disabled by default.
  • Added a one-time add-on selection dialog to manage previously installed add-ons.
  • Added Twitter to the search bar.
  • Added a preference to load tabs on demand, improving startup time when windows are restored.
  • Improved performance and memory handling when using <audio> and <video> elements.
  • Added Cross-Origin Resource Sharing (CORS) support for cross-domain textures in WebGL.
  • Added support for HTML5 context menus.
  • Added support for insertAdjacentHTML().
  • Improved CSS hyphen support for many languages.
  • Improved WebSocket support.
8.0.1 Firefox 8.0.1 November 21, 2011 Off-cycle security and stability update.[233]
  • Fixed Mac OS X crash that occurred in certain instances when a Java Applet is loaded with Java SE 6 version 1.6.0_29 installed.
  • Fixed Windows startup crash caused by RoboForm versions older than 7.6.2.

End-of-life 8.0.x product line on December 20, 2011.

Firefox 9 9.0a1 Firefox 9.0 Nightly August 17, 2011 First Firefox 9.0 Nightly build.[234]
9.0a2 Firefox 9.0 Aurora September 28, 2011 First Firefox 9.0 Aurora build.[235][236]
9.0b1 Firefox 9.0 Beta 1 November 11, 2011 First Firefox 9.0 Beta release.[237][238]
9.0b2 Firefox 9.0 Beta 2 November 17, 2011 Second Firefox 9.0 Beta release.
9.0b3 Firefox 9.0 Beta 3 November 24, 2011 Third Firefox 9.0 Beta release.
9.0b4 Firefox 9.0 Beta 4 December 1, 2011 Fourth Firefox 9.0 Beta release.
9.0b5 Firefox 9.0 Beta 5 December 8, 2011 Fifth Firefox 9.0 Beta release.
9.0b6 Firefox 9.0 Beta 6 December 15, 2011 Sixth Firefox 9.0 Beta release.
9.0 Firefox 9.0 December 20, 2011 Official Firefox 9.0 release.[239]
  • Added type inference, significantly improving JavaScript performance.
  • Improved theme integration for Mac OS X Lion.
  • Added two finger swipe navigation for Mac OS X Lion.
  • Added support for querying Do Not Track status via JavaScript.
  • Added support for the font-stretch CSS property.
  • Improved support for the text-overflow CSS property.
  • Improved standards support for HTML5, MathML, and CSS.
9.0.1 Firefox 9.0.1 December 21, 2011 Off-cycle security and stability update.[240]
  • Fixed crash on Windows, Mac and Linux

End-of-life 9.0.x product line on January 31, 2012.

Versions 10 through 19[edit]

Former release Former test release Former release – still supported Current supported official release Current supported test release Future official release Future test release Top
Release history
Browser name Version Codename Release date[1] Release type and highlights[t 1]
Firefox 10 10.0a1 Firefox 10.0 Nightly September 28, 2011 First Firefox 10.0 Nightly build.[241]
10.0a2 Firefox 10.0 Aurora November 9, 2011 First Firefox 10.0 Aurora build.[242][243]
10.0b1 Firefox 10.0 Beta 1 December 22, 2011 First Firefox 10.0 Beta release.[244][245]
10.0b2 Firefox 10.0 Beta 2 December 28, 2011 Second Firefox 10.0 Beta release.
10.0b3 Firefox 10.0 Beta 3 January 4, 2012 Third Firefox 10.0 Beta release.
10.0b4 Firefox 10.0 Beta 4 January 13, 2012 Fourth Firefox 10.0 Beta release.
10.0b5 Firefox 10.0 Beta 5 January 20, 2012 Fifth Firefox 10.0 Beta release.
10.0b6 Firefox 10.0 Beta 6 January 26, 2012 Sixth Firefox 10.0 Beta release.
10.0 Firefox 10.0 January 31, 2012 Official Firefox 10.0 release.[246] First Extended Support Release (ESR).[247]
  • Most add-ons are now compatible with new versions of Firefox by default.
  • Anti-Aliasing for WebGL is now implemented.
  • CSS3 3D-Transforms are now supported.
  • New element for bi-directional text isolation, along with supporting CSS properties.
  • Full Screen APIs allow you to build a web application that runs full screen.
10.0.1 Firefox 10.0.1 February 10, 2012 Off-cycle security and stability update.[248]
10.0.2 Firefox 10.0.2 February 16, 2012 Off-cycle security and stability update.[249]
  • Fixed Java applets that sometimes caused text input to become unresponsive.

End-of-life 10.0.x product line on March 13, 2012.

10.0.3esr Firefox 10.0.3esr March 13, 2012 Regular security and stability update.[250]
  • Security fixes[251]
  • Fixed web workers running out of memory, affecting some add-ons used by organizations.
10.0.4esr Firefox 10.0.4esr April 24, 2012 Regular security and stability update.[252]
  • Fixed an issue in Firefox ESR 10.0.3 that caused the "Whats New" page to open after an update.
  • Fixed extensions.checkCompatibility.* prefs not working in ESR releases.
10.0.5esr Firefox 10.0.5esr June 5, 2012 Regular security and stability update.[253]
  • Fixed the 10.0.5 Firefox top crash with signature [@ GLEngine@0x620cf ].
10.0.6esr Firefox 10.0.6esr July 17, 2012 Regular security and stability update.[254]
  • Fixed some text editing inconsistencies.
10.0.7esr Firefox 10.0.7esr August 28, 2012 Regular security and stability update.[255]
  • Fixed contenteditable breaks in 10.0.7 that middle-click to open links.
  • Addressed a fix that allows specifying wildcard that matches all simple netbiosnames in network.automatic-ntlm-auth.trusted-uris.
10.0.8esr Firefox 10.0.8esr October 9, 2012 Regular security and stability update.[256]
10.0.9esr Firefox 10.0.9esr October 12, 2012 Off-cycle security update.[257]
10.0.10esr Firefox 10.0.10esr October 26, 2012 Off-cycle security update.[258]
10.0.11esr Firefox 10.0.11esr November 20, 2012 Off-cycle security update.[259]
10.0.12esr Firefox 10.0.12esr January 8, 2013 Regular security update.[260] End-of-life 10.0.x ESR product line on February 12, 2013.
Firefox 11 11.0a1 Firefox 11.0 Nightly November 9, 2011 First Firefox 11.0 Nightly build.[261]
11.0a2 Firefox 11.0 Aurora December 21, 2011 First Firefox 11.0 Aurora build.[262][263]
11.0b1 Firefox 11.0 Beta 1 February 3, 2012 First Firefox 11.0 Beta release.[264][265]
11.0b2 Firefox 11.0 Beta 2 February 10, 2012 Second Firefox 11.0 Beta release.
11.0b3 Firefox 11.0 Beta 3 February 17, 2012 Third Firefox 11.0 Beta release.
11.0b4 Firefox 11.0 Beta 4 February 24, 2012 Fourth Firefox 11.0 Beta release.
11.0b5 Firefox 11.0 Beta 5 March 2, 2012 Fifth Firefox 11.0 Beta release.
11.0b6 Firefox 11.0 Beta 6 March 9, 2012 Sixth Firefox 11.0 Beta release.
11.0b7 Firefox 11.0 Beta 7 March 9, 2012 Seventh Firefox 11.0 Beta release.
11.0b8 Firefox 11.0 Beta 8 March 11, 2012 Eighth Firefox 11.0 Beta release.
11.0 Firefox 11.0 March 13, 2012 Official Firefox 11.0 release.[266]
  • Migration of settings from Google Chrome.
  • SPDY protocol support (disabled by default).
  • RFC 6455 WebSocket protocol support with an unprefixed API.
  • Page Inspector Tilt (3D View).
  • Sync Add-ons.
  • Redesigned HTML5 video controls.
  • Style Editor (CSS).

End-of-life 11.0.x product line on April 24, 2012.

Firefox 12 12.0a1 Firefox 12.0 Nightly December 20, 2011 First Firefox 12.0 Nightly build.[267]
12.0a2 Firefox 12.0 Aurora February 2, 2012 First Firefox 12.0 Aurora build.[268][269]
12.0b1 Firefox 12.0 Beta 1 March 16, 2012 First Firefox 12.0 Beta release.[270][271]
12.0b2 Firefox 12.0 Beta 2 March 22, 2012 Second Firefox 12.0 Beta release.
12.0b3 Firefox 12.0 Beta 3 March 30, 2012 Third Firefox 12.0 Beta release.
12.0b4 Firefox 12.0 Beta 4 April 5, 2012 Fourth Firefox 12.0 Beta release.
12.0b5 Firefox 12.0 Beta 5 April 16, 2012 Fifth Firefox 12.0 Beta release.
12.0b6 Firefox 12.0 Beta 6 April 18, 2012 Sixth Firefox 12.0 Beta release.
12.0 Firefox 12.0 April 24, 2012 Official Firefox 12.0 release.[272]
  • Windows: Firefox is now easier to update with one less prompt (User Account Control).
  • Last release for Windows 2000.
  • Reintroduced on-demand loading of pinned tabs after restoring a session.
  • Page Source now has line numbers.
  • Line breaks are now supported in the title attribute.
  • Improvements to "Find in Page" to center search result.
  • URLs pasted into the download manager window are now automatically downloaded.
  • Support for the text-align-last CSS property has been added.
  • Experimental support for ECMAScript 6 Map and Set objects has been implemented.
  • Some TinyMCE-based editors failed to load.
  • OS X: WebGL performance may be degraded on some hardware.

End-of-life 12.0.x product line on June 5, 2012.

Firefox 13 13.0a1 Firefox 13.0 Nightly February 1, 2012 First Firefox 13.0 Nightly build.

Windows 2000 no longer supported.[273]

13.0a2 Firefox 13.0 Aurora March 19, 2012 First Firefox 13.0 Aurora build.
13.0b1 Firefox 13.0 Beta 1 April 26, 2012 First Firefox 13.0 Beta release.[274]
13.0b2 Firefox 13.0 Beta 2 May 3, 2012 Second Firefox 13.0 Beta release.
13.0b3 Firefox 13.0 Beta 3 May 15, 2012 Third Firefox 13.0 Beta release.
13.0b4 Firefox 13.0 Beta 4 May 17, 2012 Fourth Firefox 13.0 Beta release.
13.0b5 Firefox 13.0 Beta 5 May 25, 2012 Fifth Firefox 13.0 Beta release.
13.0b6 Firefox 13.0 Beta 6 May 30, 2012 Sixth Firefox 13.0 Beta release.
13.0b7 Firefox 13.0 Beta 7 June 1, 2012 Seventh Firefox 13.0 Beta release.
13.0 Firefox 13.0 June 5, 2012 Official Firefox 13.0 release.[275]
  • When opening a new tab, users are now presented with their most visited pages.
  • The default home page now has quicker access to bookmarks, history, settings, and more.
  • SPDY protocol now enabled by default for faster browsing on supported sites.
  • Restored background tabs are not loaded by default for faster startup.
  • Smooth scrolling is now enabled by default.
  • 72 total improvements to Page Inspector, HTML panel, Style Inspector, Scratchpad and Style Editor.
  • The column-fill CSS property has been implemented.
  • Experimental support for ECMAScript 6 Map and Set objects has been implemented.
  • Support for the CSS3 background-position property extended syntax has been added.
  • The :invalid pseudo-class can now be applied to the element.
  • The CSS turn angle unit is now supported.
13.0.1 Firefox 13.0.1 June 15, 2012 Off-cycle security and stability update.[276]
  • Fixed an issue when Windows Messenger did not load in Hotmail, and the Hotmail inbox did not auto-update.
  • Fixed the Hebrew text that was sometimes rendered incorrectly.
  • Fixed an issue in Adobe Flash 11.3 that sometimes caused a crash on quit.

End-of-life 13.0.x product line on July 17, 2012.

Firefox 14 14.0a1 Firefox 14.0 Nightly March 14, 2012 First Firefox 14.0 Nightly build.
14.0a2 Firefox 14.0 Aurora April 27, 2012 First Firefox 14.0 Aurora build.
14.0b6 Firefox 14.0 Beta 6 June 7, 2012 First Firefox 14.0 Beta release.[277][278]
14.0b7 Firefox 14.0 Beta 7 June 14, 2012 Second Firefox 14.0 Beta release.
14.0b8 Firefox 14.0 Beta 8 June 22, 2012 Third Firefox 14.0 Beta release.
14.0b9 Firefox 14.0 Beta 9 June 25, 2012 Fourth Firefox 14.0 Beta release.
14.0b10 Firefox 14.0 Beta 10 July 2, 2012 Fifth Firefox 14.0 Beta release.
14.0b11 Firefox 14.0 Beta 11 July 6, 2012 Sixth Firefox 14.0 Beta release.
14.0b12 Firefox 14.0 Beta 12 July 11, 2012 Seventh Firefox 14.0 Beta release.
14.0 Firefox 14.0 June 26, 2012 Android

Official Firefox Mobile 14.0 release. [279][280]

  • Google searches now utilize HTTPS.
  • Full screen support for Mac OS X Lion implemented.
  • Plugins can now be configured to only load on click (about:config).
  • The Awesome Bar now auto-completes typed URLs.
  • Improved site identity manager, to prevent spoofing of an SSL connection with favicons.
  • Pointer Lock API implemented.
  • New API to prevent your display from sleeping.
  • New text-transform and font-variant CSS improvements for Turkic languages and Greek.
  • Long URLs now extend the status bar almost to the whole width of the viewport.
  • Gstreamer backend for HTML5 video to allow H.264 playback (needs to be enabled at compile time).
14.0.1 Firefox 14.0.1 July 17, 2012 Desktop

Official Firefox Desktop 14.0 release.[281]

  • Fixed the GIF animation that can get stuck when src and image size are changed.
  • Mac OS X: Fixed the nsCocoaWindow::ConstrainPosition that uses wrong screen in multi-display setup.
  • Fixed the CSS :hover regression when an element's class name is set by JavaScript.

End-of-life 14.0.x product line on August 28, 2012.

Firefox 15 15.0a1 Firefox 15.0 Nightly April 25, 2012 First Firefox 15.0 Nightly build.
15.0a2 Firefox 15.0 Aurora June 5, 2012 First Firefox 15.0 Aurora build.
15.0b1 Firefox 15.0 Beta 1 July 19, 2012 First Firefox 15.0 Beta release.[282]
15.0 Firefox 15.0 August 28, 2012 Official Firefox 15.0 release.[283]
  • Silent update: Background updates.
  • Support for SPDY networking protocol v3.
  • WebGL enhancements, including compressed textures for better performance.
  • Localization in Maithili.
  • Optimized memory usage for add-ons.
  • JavaScript debugger integrated into developer tools.
  • New layout view added to Inspector.
  • High precision event timer implemented.
  • The CSS word-break property has been implemented.
  • New responsive design tool allows web developers to switch between desktop and mobile views of sites.
  • Native support for the Opus audio format added.
  • The <audio> and <video> elements now support the played attribute.
  • The source element now supports the media attribute.
  • Fixed the focus rings that keep growing when repeatedly tabbing through elements.
15.0.1 Firefox 15.0.1 September 6, 2012 Off-cycle stability update.[284]
  • Addressed a fix where sites visited while in Private Browsing mode could be found through manual browser cache inspection.

End-of-life 15.0.x product line on October 9, 2012.

Firefox 16 16.0a1 Firefox 16.0 Nightly June 5, 2012 First Firefox 16.0 Nightly build.
16.0a2 Firefox 16.0 Aurora July 17, 2012 First Firefox 16.0 Aurora build.
16.0b1 Firefox 16.0 Beta 1 August 30, 2012 First Firefox 16.0 Beta release.[285]
16.0 Firefox 16.0 October 9, 2012 Official Firefox 16.0 release.[286]

Last release for Mac OS X Leopard (Intel)

  • Firefox on Mac OS X now has preliminary VoiceOver support turned on by default.
  • Initial web app support (Windows/Mac/Linux).
  • Acholi and Kazakh localizations added.
  • Improvements around JavaScript responsiveness through incremental garbage collection.
  • New Developer Toolbar with buttons for quick access to tools, error count for the Web Console, and a new command line for quick keyboard access.
  • CSS3 Animations, Transitions, Transforms and Gradients unprefixed.
  • Recently opened files list in Scratchpad implemented.
  • Fixed an issue where debugger breakpoints do not catch on page reload.
  • No longer supporting MD5 as a hash algorithm in digital signatures.
  • Opus support by default.
  • Reverse animation direction has been implemented.
  • Per tab reporting in about:memory.
  • User Agent strings for pre-release Firefox versions now show only major version.
16.0.1 Firefox 16.0.1 October 11, 2012 Off-cycle security and stability update.[287]
16.0.2 Firefox 16.0.2 October 26, 2012 Off-cycle security and stability update.[288] End-of-life 16.0.x product line on November 20, 2012.
Firefox 17 17.0a1 Firefox 17.0 Nightly July 17, 2012 First Firefox 17.0 Nightly build.
17.0a2 Firefox 17.0 Aurora August 28, 2012 First Firefox 17.0 Aurora build.
17.0b1 Firefox 17.0 Beta 1 October 9, 2012 First Firefox 17.0 Beta release.
17.0b6 Firefox 17.0 Beta 6 October 11, 2012 Second Firefox 17.0 Beta release.[289]
17.0 Firefox 17.0 November 20, 2012 Official Firefox 17.0 release.[290]
  • First revision of the Social API and support for Facebook Messenger.
  • Click-to-play blocklisting implemented to prevent vulnerable plugin versions from running without the user's permission.
  • Updated Awesome Bar experience with larger icons.
  • Mac OS X 10.5 is no longer supported.
  • JavaScript Maps and Sets are now iterable.
  • SVG FillPaint and StrokePaint implemented.
  • Improvements that make the Web Console, Debugger and Developer Toolbar faster and easier to use.
  • New Markup panel in the Page Inspector allows easy editing of the DOM.
  • Sandbox attribute for iframes implemented, enabling increased security.
  • Over twenty performance improvements, including fixes around the New Tab page.
  • Fixed pointer lock that doesn't work in web apps.
  • Fixed page scrolling on sites with fixed headers.
17.0esr Firefox 17.0esr November 20, 2012 Official Firefox 17.0 Extended Support Release (ESR).
17.0.1 Firefox 17.0.1 November 30, 2012 Off-cycle stability update.[291]
  • Reverted user agent change causing some website incompatibilities.
  • Fixed font rendering issue.

End-of-life 17.0.x product line on January 8, 2013.

17.0.1esr Firefox 17.0.1esr November 30, 2012 Off-cycle stability update.
17.0.2esr Firefox 17.0.2esr January 8, 2013 Regular security and stability updates.
  • Fixed improvements to the Click-to-Play vulnerable plugin blocklisting feature.[292]
17.0.3esr Firefox 17.0.3esr February 19, 2013 Regular security update.[293]
17.0.4esr Firefox 17.0.4esr March 7, 2013 Regular security update.[294]
17.0.5esr Firefox 17.0.5esr April 2, 2013 Regular security update.[295]
17.0.6esr Firefox 17.0.6esr May 10, 2013 Regular security update.[296]
17.0.7esr Firefox 17.0.7esr June 25, 2013 Regular security update.[297]
17.0.8esr Firefox 17.0.8esr August 6, 2013 Regular security update.[298]
17.0.9esr Firefox 17.0.9esr September 17, 2013 Regular security update.[299]
17.0.10esr Firefox 17.0.10esr October 29, 2013 Regular security update.[300]
17.0.11esr Firefox 17.0.11esr November 15, 2013 Off-cycle stability update.[301]
  • Updated ESR17 to NSS 3.14.5 RTM.

End-of-life 17.0.x ESR product line on December 3, 2013.

Firefox 18 18.0a1 Firefox 18.0 Nightly August 28, 2012 First Firefox 18.0 Nightly build.
  • Adds a Metro user interface on Windows 8.
18.0a2 Firefox 18.0 Aurora October 9, 2012 First Firefox 18.0 Aurora build.
18.0b1 Firefox 18.0 Beta 1 November 20, 2012 First Firefox 18.0 Beta release.
18.0b7 Firefox 18.0 Beta 7 November 26, 2012 Seventh Firefox 18.0 Beta release.[302]
18.0 Firefox 18.0 January 8, 2013 Official Firefox 18.0 release.[303]
  • Faster JavaScript performance via IonMonkey compiler.
  • Support for Retina displays on OS X 10.7 and up.
  • Preliminary support for WebRTC.
  • Better image quality with Mozilla's new HTML scaling algorithm.
  • Performance improvements around tab switching.
  • Support for new DOM property window.devicePixelRatio.
  • Improvement in startup time through smart handling of signed extension certificates.
  • Support for W3C touch events implemented, taking the place of MozTouch events.
  • Disable insecure content loading on HTTPS pages.
  • Improved responsiveness for users on proxies.
18.0.1 Firefox 18.0.1 January 18, 2013 Off-cycle stability update.[304]
  • Fixed problems involving HTTP Proxy Transactions.
  • Fixed unity player crashes on Mac OS X.
  • Disabled HIDPI support on external monitors to avoid rendering glitches.
18.0.2 Firefox 18.0.2 February 5, 2013 Off-cycle stability update.[305] End-of-life 18.0.x product line on February 19, 2013.
Firefox 19 19.0a1 Firefox 19.0 Nightly October 9, 2012 First Firefox 19.0 Nightly build.
19.0a2 Firefox 19.0 Aurora November 20, 2012 First Firefox 19.0 Aurora build.
19.0b1 Firefox 19.0 Beta 1 January 8, 2013 First Firefox 19.0 Beta release.
19.0b6 Firefox 19.0 Beta 6 January 10, 2013 Sixth Firefox 19.0 Beta release.[306]
19.0 Firefox 19.0 February 19, 2013 Official Firefox 19.0 release.[307]
  • Built-in PDF Viewer.
  • Canvas elements can export their content as an image blob using canvas.toBlob().
  • Startup performance improvements.
  • Debugger now supports pausing on exceptions and hiding non-enumerable properties.
  • Remote Web Console is available for connecting to Firefox on Android or Firefox OS (experimental, set devtools.debugger.remote-enabled to true).
  • There is now a Browser Debugger available for add-on and browser developers (experimental, set devtools.chrome.enabled to true).
  • Web Console CSS links now open in the Style Editor.
  • CSS @page is now supported.
  • CSS viewport-percentage length units implemented (vh, vw, vmin and vmax).
  • CSS text-transform now supports full-width.
  • Fixed certain valid WebGL drawing operations that were incorrectly rejected, leaving incomplete rendering in affected pages.
  • Fixed an issue that starting Firefox with -private flag incorrectly claims you are not in Private Browsing mode.
  • Fixed plugins that stop rendering when the top half of the plugin is scrolled off the top of the page, in HiDPI mode.
19.0.1 Firefox 19.0.1 February 27, 2013 Off-cycle stability update.[308]
  • Windows 8 only: Fixed stability issue for some AMD Radeon HD graphics cards.
19.0.2 Firefox 19.0.2 March 7, 2013 Off-cycle security update.[309] End-of-life 19.0.x product line on April 2, 2013.

Versions 20 through 29[edit]

Former release Former test release Former release – still supported Current supported official release Current supported test release Future official release Future test release Top
Release history
Browser name Version Codename Release date[1] Release type and highlights[t 1]
Firefox 20 20.0a1 Firefox 20.0 Nightly November 20, 2012 First Firefox 20.0 Nightly build.
20.0a2 Firefox 20.0 Aurora January 8, 2013 First Firefox 20.0 Aurora build.[310]
20.0b1 Firefox 20.0 Beta 1 February 22, 2013 First Firefox 20.0 Beta release.[311]
20.0b2 Firefox 20.0 Beta 2 February 27, 2013 Second Firefox 20.0 Beta release.[312]
20.0b3 Firefox 20.0 Beta 3 March 5, 2013 Third Firefox 20.0 Beta release.[313]
20.0b4 Firefox 20.0 Beta 4 March 7, 2013 Fourth Firefox 20.0 Beta release.[314]
20.0b5 Firefox 20.0 Beta 5 March 13, 2013 Fifth Firefox 20.0 Beta release.[315]
20.0b6 Firefox 20.0 Beta 6 March 20, 2013 Sixth Firefox 20.0 Beta release.[316]
20.0b7 Firefox 20.0 Beta 7 March 25, 2013 Seventh Firefox 20.0 Beta release.[317]
20.0 Firefox 20.0 April 2, 2013 Official Firefox 20.0 release.[318]
  • Per-window Private Browsing.
  • New download experience.
  • Ability to close hanging plugins, without the browser hanging.
  • Continued performance improvements around common browser tasks (page loads, downloads, shutdown, etc.).
  • Continued implementation of draft ECMAScript 6 – clear() and Math.imul.
  • New JavaScript Profiler tool.
  • getUserMedia implemented for web access to the user's camera and microphone (with user permission).
  • <canvas> now supports blend modes.
  • Various <audio> and <video> improvements.
  • Fixed: Details button on Crash Reporter.
  • Fixed: Unity plugin that doesn't display in HiDPI mode.
20.0.1 Firefox 20.0.1 April 11, 2013 Off-cycle security update.[319]
  • Windows-only update to handle issues around handling UNC paths.

End-of-life 20.0.x product line on May 14, 2013

Firefox 21 21.0a1 Firefox 21.0 Nightly January 8, 2013 First Firefox 21.0 Nightly build.
21.0a2 Firefox 21.0 Aurora February 22, 2013 First Firefox 21.0 Aurora build.[320]
21.0b1 Firefox 21.0 Beta 1 April 2, 2013 First Firefox 21.0 Beta release.
21.0b2 Firefox 21.0 Beta 2 April 4, 2013 Second Firefox 21.0 Beta release.[321]
21.0b3 Firefox 21.0 Beta 3 April 17, 2013 Third Firefox 21.0 Beta release.[322]
21.0 Firefox 21.0 May 14, 2013 Official Firefox 21.0 release.[323]
  • The Social API now supports multiple providers.
  • Enhanced three-state UI for Do Not Track (DNT).
  • Preliminary implementation of Firefox Health Report.
  • Firefox will suggest how to improve your application startup time if needed.
  • Ability to Restore removed thumbnails on New tab Page.
  • CSS -moz-user-select:none selection changed to improve compatibility with -webkit-user-select:none.
  • Graphics related performance improvements.
  • Removed E4X support from SpiderMonkey.
  • Implemented Remote Profiling.
  • Integrated, Add-on SDK loader and API libraries into Firefox.
  • Added support for <main> element.
  • Implemented scoped stylesheets.
  • Fixed: Some function keys may not work when pressed.
  • Fixed: Browsing and Download history clearing needs unification to avoid confusion on clearing download history.

End-of-life 21.0.x product line on June 25, 2013.

Firefox 22 22.0a1 Firefox 22.0 Nightly February 23, 2013 First Firefox 22.0 Nightly build.[324]
22.0a2 Firefox 22.0 Aurora April 2, 2013 First Firefox 22.0 Aurora build.
22.0b1 Firefox 22.0 Beta 1 May 16, 2013 First Firefox 22.0 Beta release.[325]
22.0 Firefox 22.0 June 25, 2013 Official Firefox 22.0 release.[326]
  • WebRTC is now enabled by default.
  • Windows: Firefox now follows display scaling options to render text larger on high-res displays.
  • Mac OS X: Download progress in Dock application icon.
  • HTML5 audio/video playback rate can now be changed.
  • Social services management implemented in Add-ons Manager.
  • asm.js optimizations (OdinMonkey) enabled for major performance improvements.
  • Improved WebGL rendering performance through asynchronous canvas updates.
  • Plain text files displayed within Firefox will now word-wrap.
  • For user security, the |Components| object is no longer accessible from web content.
  • Improved memory usage and display time when rendering images.
  • Pointer Lock API can now be used outside of fullscreen.
  • CSS3 Flexbox implemented and enabled by default.
  • New Web Notifications API implemented.
  • Added clipboardData API for JavaScript access to a user's clipboard.
  • New built-in font inspector.
  • New HTML5 and

Firefox 23 23.0a1 Firefox 23.0 Nightly April 2, 2013 First Firefox 23.0 Nightly build.
23.0a2 Firefox 23.0 Aurora May 14, 2013 First Firefox 23.0 Aurora build.
23.0b1 Firefox 23.0 Beta 1 June 27, 2013 First Firefox 23.0 Beta release.[327]
23.0 Firefox 23.0 August 6, 2013 Official Firefox 23.0 release.[328]

In this Version Mozilla changed the Firefox Logo.

  • Mixed content blocking enabled to protects users from man-in-the-middle attacks and eavesdroppers on HTTPS pages.
  • Options panel created for Web Developer Toolbox.
  • "Enable JavaScript" preference checkbox has been removed and user-set values will be reset to the default.
  • Improved about:memory's functional UI.
  • Simplified interface for notifications of plugin installation.
  • Enabled DXVA2 on Windows Vista+ to accelerate H.264 video decoding.
  • Users can now switch to a new search provider across the entire browser.
  • CSP policies using the standard syntax and semantics will now be enforced.
  • <input type='file'> rendering improvements.
  • Replaced fixed-ratio audio resampler in webrtc.org capture code with Speex resampler and eliminated pseudo-44,000 Hz rate.
  • "Load images automatically" and "Always show the tab bar" checkboxes removed from preferences and reset to defaults.
  • HTML5 <input type="range"> form control implemented.
  • Write more accessible pages on touch interfaces with new ARIA role for key buttons.
  • Social share functionality.
  • Added unprefixed requestAnimationFrame.
  • Implemented a global browser console.
  • Dropped blink effect from text-decoration: blink; and completely removed <blink> element.
  • New feature in toolbox: Network Monitor.
23.0.1 Firefox 23.0.1 August 16, 2013 Off-cycle stability update.[329]
  • Fixed rendering glitches on H.264 video only in FF23 on Vista.
  • Fixed spellchecking that was broken with non-ASCII characters in profile path.
  • Fixed audio static/"burble"/breakup in Firefox to Firefox WebRTC calls.

End-of-life 23.0.x product line on September 17, 2013.

Firefox 24 24.0a1 Firefox 24.0 Nightly May 14, 2013 First Firefox 24.0 Nightly build.
24.0a2 Firefox 24.0 Aurora June 25, 2013 First Firefox 24.0 Aurora build.
24.0b1 Firefox 24.0 Beta 1 August 8, 2013 First Firefox 24.0 Beta release.[330]
24.0 Firefox 24.0 September 17, 2013 Official Firefox 24.0 release.[331]
  • Support for new scrollbar style in Mac OS X 10.7 and newer.
  • Implemented Close tabs to the right.
  • Social: Ability to tear-off chat windows to view separately by simply dragging them out.
  • Accessibility related improvements on using pinned tabs.
  • Removed support for Revocation Lists feature.
  • Performance improvements on New Tab Page loads.
  • Major SVG rendering improvements around Image tiling and scaling.
  • Improved and unified Browser console for enhanced debugging experience, replacing existing Error console.
  • Removed support for sherlock files that are loaded from application or profile directory.
  • Replaced fixed-ratio audio resampler in webrtc.org capture code with Speex resampler and eliminated pseudo-44,000  rate.

End-of-life 24.0.x product line on October 29, 2013.

24.0esr Firefox 24.0esr September 17, 2013 Official Firefox 24.0 Extended Support Release (ESR).[332]
24.1.0esr Firefox 24.1.0esr October 29, 2013 Regular security update.[333]
24.1.1esr Firefox 24.1.1esr November 15, 2013 Off-cycle stability update.[334]
  • Updated branches that use 4.10 RTM to 4.10.2 RTM.
  • Updated Mozilla to NSS 3.15.3 (new alternative NSS branch) to pick up a few fixes.
  • Fixed an issue where some UI strings in Firefox 24.1.0 ESR l10n builds are in English.
24.2.0esr Firefox 24.2.0esr December 10, 2013 Regular security update.[335]
24.3.0esr Firefox 24.3.0esr February 4, 2014 Regular security update.[336]
24.4.0esr Firefox 24.4.0esr March 18, 2014 Regular security update.[337]
24.5.0esr Firefox 24.5.0esr April 29, 2014 Regular security update.[338]
24.6.0esr Firefox 24.6.0esr June 10, 2014 Regular security update.[339]
24.7.0esr Firefox 24.7.0esr July 22, 2014 Regular security update.[340]
24.8.0esr Firefox 24.8.0esr September 2, 2014 Regular security update.[341]
24.8.1esr Firefox 24.8.1esr September 24, 2014 Off-cycle security update.[342] End-of-life 24.x.x ESR product line on October 14, 2014.
Firefox 25 25.0a1 Firefox 25.0 Nightly June 25, 2013 First Firefox 25.0 Nightly build.
25.0a2 Firefox 25.0 Aurora August 6, 2013 First Firefox 25.0 Aurora build.
25.0b1 Firefox 25.0 Beta 1 September 19, 2013 First Firefox 25.0 Beta release.[343]
25.0 Firefox 25.0 October 29, 2013 Official Firefox 25.0 release.[344]
  • Web Audio support.
  • The find bar is no longer shared between tabs.
  • If away from Firefox for months, you now will be offered the option to migrate another browser's history and settings.
  • Resetting Firefox no longer clears your browsing session.
  • CSS3 background-attachment:local support to control background scrolling.
  • Many new ES6 functions implemented.
  • iframe document content can now be specified inline.
  • Fixed blank or missing page thumbnails when opening a new tab.
25.0.1 Firefox 25.0.1 November 15, 2013 Off-cycle security and stability update.[345]
  • Fixed pages that sometimes wouldn't load without first moving the cursor.

End-of-life 25.0.x product line on December 10, 2013

Firefox 26 26.0a1 Firefox 26.0 Nightly August 6, 2013 First Firefox 26.0 Nightly build.
26.0a2 Firefox 26.0 Aurora September 17, 2013 First Firefox 26.0 Aurora build.
26.0b1 Firefox 26.0 Beta 1 October 31, 2013 First Firefox 26.0 Beta release.[346]
26.0 Firefox 26.0 December 10, 2013 Official Firefox 26.0 release.[347]
  • All Java plug-ins are defaulted to 'click to play'.
  • Password manager now supports script-generated password fields.
  • Updates can now be performed by Windows users without write permissions to Firefox install directory (requires Mozilla Maintenance Service).
  • Support for H.264 on Linux if the appropriate gstreamer plug-ins are installed.
  • Support for MP3 decoding on Windows XP, completing MP3 support across Windows OS versions.
  • CSP implementation now supports multiple policies, including the case of both an enforced and Report-Only policy, per the specification.
  • Social API now supports Social Bookmarking for multiple providers through its SocialMarks functionality.
  • Math.ToFloat32 takes a JavaScript value and converts it to a Float32, whenever possible.
  • There is no longer a prompt when websites use appcache.
  • Support for the CSS image orientation property.
  • New App Manager allows you to deploy and debug HTML5 webapps on Firefox OS phones and the Firefox OS Simulator.
  • IndexedDB can now be used as a "optimistic" storage area so it doesn't require any prompts and data is stored in a pool with LRU eviction policy, in short temporary storage.
  • Fixed: When displaying a standalone image, Firefox matches the Exif orientation information contained within the JPEG image.
  • Fixed: Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1.
  • Improved page load times due to no longer decoding images that are not visible.
  • Fixed: AudioToolbox MP3 backend for Mac OS X.
26.0.1 Firefox 26.0.1 December 20, 2013 Off-cycle stability mobile release.[348]
  • Fixed the screen that distorts on some devices after tapping on search suggestion.
  • Fixed: About:home is missing translations in some locales. Most affected are: ca, ga-IE, hu, ko, pt-BR, pt-PT, ro, and uk.
  • Fixed: In some cases, the clip set on the page doesn't update when the addressbar hides.
  • Fixed: Invalid position:fixed rendering.

End-of-life 26.0.x product line on February 4, 2014.

Firefox 27 27.0a1 Firefox 27.0 Nightly September 17, 2013 First Firefox 27.0 Nightly build.
27.0a2 Firefox 27.0 Aurora October 29, 2013 First Firefox 27.0 Aurora build.
27.0b1 Firefox 27.0 Beta 1 December 12, 2013 First Firefox 27.0 Beta release.[349]
27.0 Firefox 27.0 February 4, 2014 Official Firefox 27.0 release.
  • You can now run more than one service at a time with Firefox SocialAPI, allowing you to receive notifications, chat and more from multiple integrated services.
  • Enabled TLS 1.1 (RFC 4346) and TLS 1.2 (RFC 5246) by default.
  • Added support for SPDY 3.1 protocol.
  • Ability to reset style sheets using all:unset.
  • You can now choose to deobfuscate javascript in the debugger.
  • Added support for scrolled fieldsets.
  • Implemented allow-popups directive for iframe sandbox, enabling increased security.
  • CSS cursor keywords -moz-grab and -moz-grabbing have been unprefixed.
  • Added support for ES6 generators in SpiderMonkey.
  • Implemented support for mathematical function Math.hypot() in ES6.
  • Dashed line support on Canvas.
  • Had Azure/Skia content rendering working on Linux.
27.0.1 Firefox 27.0.1 February 13, 2014 Off-cycle stability release.[350]
  • Fixed stability issues with Greasemonkey and other JavaScript that used ClearTimeoutOrInterval.
  • Fixed: JavaScript math correctness issue.

End-of-life 27.0.x product line on March 18, 2014.

Firefox 28 28.0a1 Firefox 28.0 Nightly October 29, 2013 First Firefox 28.0 Nightly build.
28.0a2 Firefox 28.0 Aurora December 10, 2013 First Firefox 28.0 Aurora build.
28.0b1 Firefox 28.0 Beta 1 February 6, 2014 First Firefox 28.0 Beta release.[351]
28.0 Firefox 28.0 March 18, 2014 Official Firefox 28.0 release.[citation needed]
  • VP9 video decoding implemented.
  • Mac OS X: Notification Center support for web notifications.
  • Volume control for HTML5 audio/video.
  • Support for Opus in WebM.
  • Now that SPDY/3 is implemented support for SPDY/2 has been removed and servers without SPDY/3 will negotiate to HTTP/1 without any penalty.
  • Support for MathML 2.0 'mathvariant' attribute.
  • Background thread hang reporting.
  • Support for multi-line flexbox in layout.
28.0.1 Firefox 28.0.1 March 24, 2014 Android

Off-cycle stability mobile update.[352]

  • Fixed: No H.264 video playback on several Galaxy devices.
  • Fixed: Mobile-only security fix for file:paths.

End-of-life 28.0.x product line on April 29, 2014.

Firefox 29 29.0a1 Firefox 29.0 Nightly December 10, 2013 First Firefox 29.0 Nightly build.
29.0a2 Firefox 29.0 Aurora February 4, 2014 First Firefox 29.0 Aurora build.
29.0b1 Firefox 29.0 Beta 1 March 20, 2014 First Firefox 29.0 Beta release.[353]
29.0 Firefox 29.0 April 29, 2014 Official Firefox 29.0 release.[citation needed]
  • Significant new customization mode.
  • A new menu sits in the right hand corner of Firefox and includes popular browser controls.
  • New tabs provide an overall smoother look and fade into the background when not active.
  • An interactive onboarding tour to guide users through the new Firefox changes.
  • Added the ability to set up Firefox Sync by creating a Firefox account.
  • Gamepad API finalized and enabled.
  • Malay [ma] locale added.
  • Clicking on a W3C Web Notification will switch to the originating tab.
  • 'box-sizing' (dropping the -moz- prefix) implemented.
  • Console object available in web workers.
  • Promises enabled by default.
  • SharedWorker enabled by default.
  • <input type="number"> implemented and enabled.
  • <input type="color"> implemented and enabled.
  • Enabled ECMAScript Internationalization API.
  • Add-on bar has been removed, content moved to navigation bar.
  • No longer possible to move tabs from the top of the browser without an add-on.
29.0.1 Firefox 29.0.1 May 9, 2014 Off-cycle stability update.[354]
  • Fixed: An issue with pdf.js printing white pages.
  • Fixed: Tabs not visible with dark themes under Windows 8.1.
  • Fixed: Session Restore failed with a corrupted sessionstore.js file.
  • Fixed: Seer disabled by default.

End-of-life 29.0.x product line on June 10, 2014.

Versions 30 through 39[edit]

Former release Former test release Former release – still supported Current supported official release Current supported test release Future official release Future test release Top
Release history
Browser name Version Codename Release date[1] Release type and highlights[t 1]
Firefox 30 30.0a1 Firefox 30.0 Nightly February 4, 2014 First Firefox 30.0 Nightly build.
30.0a2 Firefox 30.0 Aurora March 18, 2014 First Firefox 30.0 Aurora build.
30.0b1 Firefox 30.0 Beta 1 May 1, 2014 First Firefox 30.0 Beta release.[355]
30.0 Firefox 30.0 June 10, 2014 Official Firefox 30.0 release.[citation needed]
  • Sidebars button in browser chrome enables faster access to social, bookmark, & history sidebars.
  • Mac OS X command-E sets find term to selected text.
  • Support for GStreamer 1.0.
  • Disallowed calling WebIDL constructors as functions on the web.
  • With the exception of those bundled inside an extension or ones that are whitelisted, plugins will no longer be activated by default.
  • Fixes to box-shadow and other visual overflow.
  • Mute and volume available per window when using WebAudio.
  • Background-blend-mode enabled by default.
  • Use of line-height allowed for <input type="reset|button|submit">.
  • ES6 array and generator comprehensions implemented.
  • Error stack now contains column number.
  • Support for alpha option in canvas context options.
  • Fixed: Ignored autocomplete="off" when offering to save passwords via the password manager.
  • Fixed TypedArrays that don't support new named properties.

End-of-life 30.0.x product line on July 22, 2014.

Firefox 31 31.0a1 Firefox 31.0 Nightly March 18, 2014 First Firefox 31.0 Nightly build.
31.0a2 Firefox 31.0 Aurora April 29, 2014 First Firefox 31.0 Aurora build.
31.0b1 Firefox 31.0 Beta 1 June 12, 2014 First Firefox 31.0 Beta release.[356]
31.0 Firefox 31.0 July 22, 2014 Official Firefox 31.0 release.[citation needed]
  • Adds the search field to the new tab page.
  • mozilla::pkix as default certificate verifier.
  • Blocks malware from downloaded files.
  • Partial implementation of the OpenType MATH table.
  • Support of Prefer:Safe http header for parental control.
  • audio/video .ogg and .pdf files handled by Firefox if no application specified (Windows only).
  • Upper Sorbian [hsb] locale added.
  • Removal of the CAPS infrastructure for specifying site-specific permissions (via capability.policy.* preferences). Most notably, attempts to use this functionality to grant access to the clipboard will no longer work. The sole exception is the checkloaduri permission, which may still be used as before to allow sites to load file:// URIs.
  • WebVTT implemented and enabled.
  • CSS3 variables implemented.
  • Developer Tools: Add-on Debugger.
  • Developer Tools: Canvas Debugger.
  • New Array built-in: Array.prototype.fill().
  • New Object built-in: Object.setPrototypeOf().
  • CSP 1.1 nonce-source and hash-source enabled by default.
  • Developer Tools: Eyedropper tool added to the color picker.
  • Developer Tools: Editable Box Model.
  • Developer Tools: Code Editor improvements.
  • Developer Tools: Console stack traces.
  • Developer Tools: Copy as cURL.
  • Developer Tools: Styled console logs.
  • navigator.sendBeacon enabled by default.
  • Dialogs spawned from the onbeforeunload event no longer block access to the rest of the browser.
  • Fixed: Search for partially selected link text from context menu.

End-of-life 31.0.x product line on September 2, 2014.

31.0esr Firefox 31.0esr July 22, 2014 Official Firefox 31.0 Extended Support Release (ESR).[332]
31.1.0esr Firefox 31.1.0esr September 2, 2014 Regular security update.[357]
31.1.1esr Firefox 31.1.1esr September 24, 2014 Off-cycle security update.[358]
31.2.0esr Firefox 31.2.0esr October 14, 2014 Regular security and stability update.[359]
  • Fixed: Invalid certificate issue with mozilla::pkix.
  • Fixed: Importing an RSA private key fails if p < q.
31.3.0esr Firefox 31.3.0esr December 1, 2014 Regular security and stability update.[360]
  • Fixed: @ JS::Handle::operator JSObject* const&() startup crash.
  • Fixed: Intermittent failures in add-ons manager mochitest-browser tests.
  • Fixed: Bad CPU type in executable running mochitests on Mac OS X Yosemite.
  • Fixed: Error building nsChildView.mm on Mac OS X Yosemite.
  • Fixed: Build error on Mac OS X Yosemite.
  • Fixed: Wrong CPU features detection on some x86 CPUs.
  • Fixed: XMLHttpRequest.send({}) should not throw.
31.4.0esr Firefox 31.4.0esr January 13, 2015 Regular security update.[361]
31.5.0esr Firefox 31.5.0esr February 24, 2015 Regular security update.[362]
31.5.2esr Firefox 31.5.2esr March 20, 2015 Off-cycle security update.[363]
31.5.3esr Firefox 31.5.3esr March 21, 2015 Off-cycle security update.[364]
31.6.0esr Firefox 31.6.0esr March 31, 2015 Regular security update.[365]
31.7.0esr Firefox 31.7.0esr May 12, 2015 Regular security update.[366]
31.8.0esr Firefox 31.8.0esr July 2, 2015 Regular security update.[367] End-of-life 31.x.x ESR product line on August 11, 2015.
Firefox 32 32.0a1 Firefox 32.0 Nightly April 29, 2014 First Firefox 32.0 Nightly build.
32.0a2 Firefox 32.0 Aurora June 10, 2014 First Firefox 32.0 Aurora build.
32.0b1 Firefox 32.0 Beta 1 July 24, 2014 First Firefox 32.0 Beta release.[368]
32.0 Firefox 32.0 September 2, 2014 Official Firefox 32.0 release.[citation needed]
  • New HTTP cache provides improved performance including crash recovery.
  • Integration of generational garbage collection.
  • Public key pinning support enabled.
  • Displays the number of found items in the find toolbar.
  • Easier back, forward, reload, and bookmarking through the context menu.
  • Views historical use information for logins stored in password manager.
  • Lower Sorbian [dsb] locale added.
  • Removed and turned off trust bit for some 1024-bit root certificates.
  • Performance improvements to Password Manager and Add-on Manager.
  • drawFocusIfNeeded enabled by default.
  • CSS position:sticky enabled by default.
  • mix-blend-mode enabled by default.
  • Vibration API updated to latest W3C spec.
  • box-decoration-break enabled by default.
  • ECMAScript 6 built-in method Array#copyWithin implemented.
  • New Array built-in: Array.from()
  • navigator.languages property and languagechange event implemented.
  • CSS box-decoration-break replaces -moz-background-inline-policy.
  • HiDPI support in Developer Tools UI.
  • Inspector button moved to the top left.
  • Hidden nodes displayed differently in the markup-view.
  • New Web Audio Editor.
  • Code completion and inline documentation added to Scratchpad.
  • Fixed: Mac OS X: cmd-L does not open a new window when no window is available.
  • Fixed Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1.
32.0.1 Firefox 32.0.1 September 9, 2014 (Android)
September 12, 2014 (desktop)
Off-cycle stability update.[369]
Desktop
  • Fixed stability issues for computers with multiple graphics cards.
  • Fixed mixed content icon that may be incorrectly displayed instead of lock icon for SSL sites.
  • Fixed: WebRTC: setRemoteDescription() silently fails if no success callback is specified.
Android
  • Fixed link tap selection that was offset on some Android devices.
32.0.2 Firefox 32.0.2 September 18, 2014 Desktop

Off-cycle stability update.[370]

  • Fixed corrupt installations causing Firefox to crash on update.
32.0.3 Firefox 32.0.3 September 24, 2014 Off-cycle security update.[371] End-of-life 32.0.x product line on October 14, 2014.
Firefox 33 33.0a1 Firefox 33.0 Nightly June 10, 2014 First Firefox 33.0 Nightly build.
33.0a2 Firefox 33.0 Aurora July 22, 2014 First Firefox 33.0 Aurora build.
33.0b1 Firefox 33.0 Beta 1 September 2, 2014 First Firefox 33.0 Beta release.[372]
33.0 Firefox 33.0 October 14, 2014 Official Firefox 33.0 release.[373]
  • Windows: OMTC enabled by default.
  • OpenH264 support (sandboxed).
  • Improved search experience through the location bar.
  • Slimmer and faster JavaScript strings.
  • Search suggestions on the Firefox Start (about:home) and new tab (about:newtab) pages.
  • New CSP (Content Security Policy) backend.
  • Support for connecting to HTTP proxy over HTTPS.
  • Improved reliability of the session restoration.
  • Azerbaijani [az] locale added.
  • Proprietary window.crypto properties/functions removed.
  • JSD (JavaScript Debugger Service) removed in favor of the Debugger interface.
  • @counter-style rule from CSS3 Counter Styles specification implemented.
  • DOMMatrix interface implemented.
  • Cubic-bezier curves editor.
  • Displayed which elements have listeners attached.
  • New sidebar which displays a list of shortcuts to every @media rule in the current stylesheet.
  • Paint flashing for browser content repaints.
  • Editable @keyframes rules in the Rules section of the Inspector.
  • CSS transform highlighter in the style-inspector.
  • Fixed incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers.
33.0.1 Firefox 33.0.1 October 24, 2014 Desktop

Off-cycle stability update.[374]

  • Fixed: Firefox displays a black screen at startup with certain graphics drivers.
33.0.2 Firefox 33.0.2 October 28, 2014 Desktop

Off-cycle stability update.[375]

  • Fixed a startup crash with some combination of hardware and drivers.
33.0.3 Firefox 33.0.3 November 6, 2014 Desktop

Off-cycle stability update.[376]

  • Blacklisted graphics drivers that were causing black screens with OMTC enabled.
  • Fixed two startup crashes with some combination of hardware and drivers.
33.1 Firefox 33.1 November 10, 2014 Firefox's 10-year anniversary.[377][378]
  • Forget button added.
  • Enhanced tiles.
  • Privacy tour introduced.
  • Adding DuckDuckGo as a search option.
33.1.1 Firefox 33.1.1 November 14, 2014 Desktop

Off-cycle stability update.[379]

  • Fixed a startup crash.

End-of-life 33.x product line on December 1, 2014.

Firefox 34 34.0a1 Firefox 34.0 Nightly July 22, 2014 First Firefox 34.0 Nightly build.
34.0a2 Firefox 34.0 Aurora September 2, 2014 First Firefox 34.0 Aurora build.
34.0b1 Firefox 34.0 Beta 1 October 16, 2014 First Firefox 34.0 Beta release.[380]
34.0 Firefox 34.0 December 1, 2014 Official Firefox 34.0 release.[citation needed]
  • Default search engine changed to Yandex for Belarusian, Kazakh, and Russian locales.
  • Improved search bar (en-US only).
  • Firefox Hello real-time communication client.
  • Easily switch themes/personas directly in the Customizing mode.
  • Wikipedia search now uses HTTPS for secure searching (en-US only).
  • Implementation of HTTP/2 (draft14) and ALPN.
  • Recover from a locked Firefox process in the "Firefox is already running" dialog on Windows.
  • Disabled SSLv3.
  • Proprietary window.crypto properties/functions re-enabled (to be removed in Firefox 35).
  • Firefox signed by Apple OS X version 2 signature.
  • ECMAScript 6 WeakSet Implemented.
  • JavaScript Template Strings Implemented.
  • CSS3 Font variants and features control (e.g. kerning) implemented.
  • WebCrypto:
    • RSA-OAEP, PBKDF2, ECDH, and AES-KW support.
    • wrapKey and unwrapKey implemented.
    • Import/export of JWK-formatted keys.
  • matches() DOM API implemented (formerly mozMatchesSelector()).
  • Performance.now() for workers implemented.
  • WebIDE: Create, edit, and test a new Web application from your browser.
  • Highlight all nodes that match a given selector in the Style Editor and the Inspector's Rules panel.
  • Improved User Interface of the Profiler.
  • console.table function added to web console.
  • Fixed: CSS transitions start correctly when started at the same time as changes to display, position, overflow, and similar properties.
34.0.5 Firefox 34.0.5 December 1, 2014 Desktop

Official Firefox 34.0.5 release.[citation needed]

  • Default search engine changed to Yahoo! for North America.

End-of-life 34.0.x product line on January 13, 2015.

Firefox 35 35.0a1 Firefox 35.0 Nightly September 2, 2014 First Firefox 35.0 Nightly build.
35.0a2 Firefox 35.0 Aurora
Firefox 35.0 Developer Edition
October 14, 2014 First Firefox 35.0 Aurora build.

Renamed to Firefox Developer Edition since November 10, 2014.[381][382]

35.0b1 Firefox 35.0 Beta 1 December 4, 2014 First Firefox 35.0 Beta release.[383]
35.0 Firefox 35.0 January 13, 2015 Official Firefox 35.0 release.[384]
  • Firefox Hello with new rooms-based conversations model.
  • New search UI improved and enabled for more locales.
  • Access the Firefox Marketplace from the Tools menu and optional toolbar button.
  • Built-in support for H264 (MP4) on Mac OS X Snow Leopard (10.6) and newer through native APIs.
  • Use of tiled rendering on Mac OS X.
  • Improved high quality image resizing performance.
  • Improved handling of dynamic styling changes to increase responsiveness.
  • Implemented HTTP Public Key Pinning Extension (for enhanced authentication of encrypted connections).
  • Added support for the CSS Font Loading API.
  • Resource Timing API implemented.
  • CSS filters enabled by default.
  • Changed JavaScript 'let' semantics to match the ES6 specification.
  • Support for inspecting ::before and ::after pseudo elements.
  • Computed view: Nodes matching the hovered selector are now highlighted.
  • Network Monitor: New request/response headers view.
  • Added support for the EXT_blend_minmax WebGL extension.
  • Fixed: Show DOM Properties context menu item in inspector.
  • Reduced resource usage for scaled images.
  • PDF.js updated to version 1.0.907.
  • Non-HTTP(S) XHR now returns correct status code.
35.0.1 Firefox 35.0.1 January 26, 2015 (desktop)
February 2, 2015 (Android)
Off-cycle stability update.[385][citation needed]
  • Fixed a crash with the Enhanced Steam extension.
  • Fixed a potential startup crash.
  • Fixed Kerberos authentication failure with alias.
  • Fixed SVG / CSS animation regression causing rendering issues on websites like openstreetmap.org.
  • Fixed a crash on Godaddy webmail.
  • Fixed an update failure of document.baseURI to document.location after base tag was removed from DOM for site with a CSP.
  • Fixed a text selection broken with a Right-to-left (RTL) version of Firefox.
  • CSP had a change in behavior with regard to case sensitivity resources loading.
Android
  • Fixed crash with video playback on Asus MeMO Pad 10 and 8, Tesco Hudl, Lenovo Lifetab E models, and several other devices running the Rockchip SoC.

End-of-life 35.0.x product line on February 24, 2015.

Firefox 36 36.0a1 Firefox 36.0 Nightly October 14, 2014 First Firefox 36.0 Nightly build.
36.0a2 Firefox 36.0 Developer Edition December 5, 2014 First Firefox 36.0 Developer Edition build.
36.0b1 Firefox 36.0 Beta 1 January 15, 2015 First Firefox 36.0 Beta release.[386]
36.0 Firefox 36.0 February 24, 2015 (desktop)
February 27, 2015 (Android)
Official Firefox 36.0 release.[citation needed]
  • Pinned tiles on the new tab page can be synced.
  • Added full support for HTTP/2.
  • Locale added: Uzbek (UZ).
  • Remote option removed.
  • No longer accepting insecure RC4 ciphers whenever possible.
  • Phasing out Certificates with 1024-bit RSA Keys.
  • Shut down hangs will now show the crash reporter before exiting the program.
  • Add-on compatibility changed.
  • Support for the ECMAScript 6 Symbol data type added.
  • Unicode-range CSS descriptor implemented.
  • CSSOM-View scroll behavior implemented allowing smooth scrolling of content without custom libraries.
  • Object-fit and object-position implemented.
  • Isolation CSS property implemented.
  • CSS3 will-change property implemented.
  • Changed JavaScript 'const' semantics to conform better to the ES6 specification.
  • Improved ES6 generators for better performance.
  • Eval sources now appear in the Debugger.
  • DOM Promises inspection.
  • Inspector: More paste options in markup view.
  • CSS gradients work on premultiplied colors.
  • Fixed some unexpected logout from Facebook or Google after restart.
36.0.1 Firefox 36.0.1 March 5, 2015 (desktop)
March 6, 2015 (Android)
Off-cycle stability update.[387]
  • Disabled the usage of the ANY DNS query type.
  • Fixed a startup crash with EMET.
  • Fixed the Hello contact that may become inactive until restart.
  • Fixed print preferences that may not be preserved.
  • Fixed Hello contact tabs that may not be visible.
  • Accepted hostnames that include an underscore character _.
  • Fixed the WebGL that may use significant memory with Canvas2d.
  • Option -remote has been restored.
  • Fixed a top crash.
36.0.2 Firefox 36.0.2 March 16, 2015 Android

Off-cycle stability mobile update.[388]

  • Fixed a startup crash on HTC One M8 devices (Verizon) with Android 5.0.1.
  • Fixed some potential crashes with Flash videos.
36.0.3 Firefox 36.0.3 March 20, 2015 Off-cycle security update.[389][citation needed]
  • Security fix for an issue disclosed at HP Zero Day Initiative's Pwn2Own contest.
36.0.4 Firefox 36.0.4 March 21, 2015 Off-cycle security update.[390][citation needed]
  • Security fix for an issue disclosed at HP Zero Day Initiative's Pwn2Own contest.

End-of-life 36.0.x product line on March 31, 2015.

Firefox 37 37.0a1 Firefox 37.0 Nightly November 28, 2014 First Firefox 37.0 Nightly build.
37.0a2 Firefox 37.0 Developer Edition January 16, 2015 First Firefox 37.0 Developer Edition build.
37.0b1 Firefox 37.0 Beta 1 February 26, 2015 First Firefox 37.0 Beta release.[391]
37.0 Firefox 37.0 March 31, 2015 Official Firefox 37.0 release.[citation needed]
  • Heartbeat user rating system – your feedback about Firefox.
  • Yandex set as default search provider for the Turkish locale.
  • Bing search now uses HTTPS for secure searching.
  • Improved protection against site impersonation via OneCRL centralized certificate revocation.
  • Opportunistically encrypts HTTP traffic where the server supports HTTP/2 AltSvc.
  • Disabled insecure TLS version fallback for site security.
  • Extended SSL error reporting for reporting non-certificate errors.
  • TLS False Start optimization now requires a cipher suite using AEAD construction.
  • Improved certificate and TLS communication security by removing support for DSA.
  • Improved performance of WebGL rendering on Windows.
  • Implemented a subset of the Media Source Extensions (MSE) API to allow native HTML5 playback on YouTube.
  • Added support for CSS display:contents.
  • IndexedDB now accessible from worker threads.
  • New SDP/JSEP implementation in WebRTC.
  • Debug tabs opened in Chrome Desktop, Chrome for Android, and Safari for iOS.
  • New Inspector animations panel to control element animations.
  • New Security Panel included in Network Panel.
  • Debugger panel support for chrome:// and about:// URIs.
  • Added logging of weak ciphers to the web console.
37.0.1 Firefox 37.0.1 April 3, 2015 Off-cycle stability and security update.[392]
  • Disabled HTTP/2 AltSvc.
Desktop
  • Fixed start-up crash due to graphics hardware and third party software.
Android
  • Fixed crash due to WebRTC usage on certain web sites.
37.0.2 Firefox 37.0.2 April 14, 2015 (Android)
April 20, 2015 (desktop)
Off-cycle stability and security update.[393][citation needed]
Desktop
  • Fixed an issue with Google Maps rendering incorrectly in some cases.
  • Fixed stability issues for some graphics hardware and feature sets.
  • Security fixes.
Android
  • Fixed an issue related to the "request desktop site" feature.

End-of-life 37.0.x product line on May 12, 2015.

Firefox 38 38.0a1 Firefox 38.0 Nightly January 12, 2015 First Firefox 38.0 Nightly build.
38.0a2 Firefox 38.0 Developer Edition February 27, 2015 First Firefox 38.0 Developer Edition build.
38.0b1 Firefox 38.0 Beta 1 April 3, 2015 First Firefox 38.0 Beta release.[394]
38.0 Firefox 38.0 May 12, 2015 Official Firefox 38.0 release.[citation needed]
  • New tab-based preferences.
  • Ruby annotation support.
  • Base for the next ESR release.
  • autocomplete=off is no longer supported for username/password fields.
  • URL parser avoids doing percent encoding when setting the Fragment part of the URL, and percent decoding when getting the Fragment in line with the URL spec.
  • RegExp.prototype.source now returns "(?:)" instead of the empty string for empty regular expressions.
  • Improved page load times via speculative connection warmup.
  • WebSocket now available in web workers.
  • BroadcastChannel API implemented.
  • Implemented srcset attribute and <picture> element for responsive images.
  • Implemented DOM3 Events KeyboardEvent.code.
  • Mac OS X: Implemented a subset of the Media Source Extensions (MSE) API to allow native HTML5 playback on YouTube.
  • Implemented Encrypted Media Extensions (EME) API to support encrypted HTML5 video/audio playback (Windows Vista or later only).
  • Automatically downloaded Adobe Primetime Content Decryption Module (CDM) for DRM playback through EME (Windows Vista or later only).
  • Optimized-out variables are now visible in Debugger UI.
  • XMLHttpRequest logs in the web console are now visually labelled and can be filtered separately from regular network requests.
  • WebRTC now has multistream and renegotiation support.
  • copy command added to console.
38.0esr Firefox 38.0esr May 12, 2015 Official Firefox 38.0 Extended Support Release (ESR).[332]
38.0.1 Firefox 38.0.1 May 14, 2015 (desktop)
May 15, 2015 (Android)
Off-cycle stability update.[395][citation needed]
Desktop
  • Fixed a crash on start-up with first generation NVidia Optimus graphics cards.
  • Fixed a problem in which users who import cookies from Google Chrome can end up with broken websites.
  • Fixed a problem that large animated images may fail to play and may stop other images from loading.
  • Fixed a problem that WebRTC H264 video streams from CiscoSpark native clients are not decoded correctly (Fixed in Firefox ESR 38.0.1; was already fixed in Firefox 38.0).
Android
  • Fixed a crash on start-up on devices for which Firefox does not support Android hardware acceleration.
  • Fixed a problem that large animated images may fail to play and may stop other images from loading.
  • Fixed a problem that Mozilla Location Service (MLS) stumbler may not submit all data.
38.0.1esr Firefox 38.0.1esr May 14, 2015 Off-cycle stability update.[395]
38.0.5 Firefox 38.0.5 June 2, 2015 Official Firefox 38.0.5 release.[396][citation needed]
Desktop
  • Integration of Pocket.
  • Implementation of Reader View.
  • Share the active tab or window in a Hello conversation.
  • Fixed a problem that would cause Firefox to stop painting when switching tabs.
  • Fixed graphics performance when using the built-in VGA driver on Windows 7.
Android
  • Integrated Adjust SDK to measure aggregate installs.
  • Fixed various stability fixes.

End-of-life 38.0.x product line on July 2, 2015.

38.1.0esr Firefox 38.1.0esr July 2, 2015 Regular security update.[397]
38.1.1esr Firefox 38.1.1esr August 6, 2015 Off-cycle security update.[citation needed]
38.2.0esr Firefox 38.2.0esr August 11, 2015 Regular security and stability update.[399]
  • Fixed: Firefox may become unresponsive after right-clicking Flash content on Windows 8.
  • Fixed: Firefox may crash during mp4 video playback.
  • Fixed branded Firefox application that does not open URLs in system default browser.
  • Fixed significant memory leak with GreaseMonkey add-on.
  • Fixed crash [@ RtlEnterCriticalSection | MessageLoop::PostTask_Helper] on browser shutdown.
  • Fixed browser UI that becomes unresponsive state when using Unity Web Player Plugin.
  • Fixed ESRs that would not build on hppa platform.
  • Fixed crash in mozilla::layers::SyncObjectD3D11::FinalizeFrame().
38.2.1esr Firefox 38.2.1esr August 27, 2015 Off-cycle security update.[400]
38.3.0esr Firefox 38.3.0esr September 22, 2015 Regular security update.[401]
38.4.0esr Firefox 38.4.0esr November 3, 2015 Regular security update.[402]
38.5.0esr Firefox 38.5.0esr December 15, 2015 Regular security update.[403]
  • Improved stability with Java.
38.5.1esr Firefox 38.5.1esr December 21, 2015 Off-cycle stability update.[404]
  • Preparing to use SHA-256 signing certificate for Windows builds, to meet new signing requirement.
38.5.2esr Firefox 38.5.2esr December 22, 2015 Off-cycle security and stability update.[405]
  • Use of a SHA-256 signing certificate for Windows builds, to meet new signing requirements.
38.6.0esr Firefox 38.6.0esr January 26, 2016 Regular security update.[406]
38.6.1esr Firefox 38.6.1esr February 11, 2016 Off-cycle graphite2 library update.[407]
  • Updated graphite2 library to latest release.
38.7.0esr Firefox 38.7.0esr March 8, 2016 Regular security update.[408]
38.7.1esr Firefox 38.7.1esr March 16, 2016 Off-cycle stability update.[409]
  • Fixed an issue in which loading from history can show the wrong url in the location bar.
  • Disabled Graphite font shaping library.
38.8.0esr Firefox 38.8.0esr April 26, 2016 Regular security update.[410]
Firefox 39 39.0a1 Firefox 39.0 Nightly February 23, 2015 First Firefox 39.0 Nightly build.
39.0a2 Firefox 39.0 Developer Edition April 3, 2015 First Firefox 39.0 Developer Edition build.
39.0b1 Firefox 39.0 Beta 1 May 28, 2015 First Firefox 39.0 Beta release.[411]
39.0 Firefox 39.0 July 2, 2015 Official Firefox 39.0 release.[citation needed]
  • Share Hello URLs with social networks.
  • Project Silk for Mac OS X: Smoother animation and scrolling.
  • Support for 'switch' role in ARIA 1.1 (web accessibility).
  • SafeBrowsing malware detection lookups enabled for downloads on Mac OS X and Linux.
  • Support for new Unicode 8.0 skin tone emoji.
  • Removed support for insecure SSLv3 for network communications.
  • Disable use of RC4 except for temporarily whitelisted hosts.
  • The malware detection service for downloads now covers common Mac file types.
  • Performance of displaying dashed lines is improved on Mac OS X.
  • List-style-type now accepts a string value.
  • Enable the Fetch API for network requests from dedicated, shared and service workers.
  • Cascading of CSS transitions and animations now matches the current spec.
  • Implement <link rel="preconnect">allowing anticipation of a future connection without revealing any information.
  • Added support for CSS Scroll Snap Points.
  • Drag and drop enabled for nodes in Inspector markup view.
  • Webconsole input history persists even after closing the toolbox.
  • Cubic bezier tooltip now shows a gallery of timing-function presets for use with CSS animations.
  • localhost is now available offline for WebSocket connections.
  • Improve performance for IPv6 fallback to IPv4.
  • Fixed incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers.
  • Fixed the security state indicator on a page now correctly ignores loads caused by previous pages.
  • Fixed an issue where a Hello conversation window would sometimes fail to open.
  • Fixed a regression that could lead to Flash not displaying has been fixed.
  • Update to NSS 3.19.2.
39.0.3 Firefox 39.0.3 August 6, 2015 Off-cycle security update.[citation needed]

End-of-life 39.0.x product line on August 11, 2015.

Versions 40 through 49[edit]

Former release Former test release Former release – still supported Current supported official release Current supported test release Future official release Future test release Top
Release history
Browser name Version Codename Release date[1] Release type and highlights[t 1]
Firefox 40 40.0a1 Firefox 40.0 Nightly March 30, 2015 First Firefox 40.0 Nightly build.
40.0a2 Firefox 40.0 Developer Edition May 15, 2015 First Firefox 40.0 Developer Edition build.
40.0b1 Firefox 40.0 Beta 1 July 3, 2015 First Firefox 40.0 Beta release.[412]
40.0 Firefox 40.0 August 11, 2015 Official Firefox 40.0 release.
  • Support for Windows 10.
  • Added protection against unwanted software downloads.
  • User can receive suggested tiles in the new tab page based on categories Firefox matches to browsing history (en-US only).
  • Hello allows adding a link to conversations to provide context on what the conversation will be about.
  • New style for add-on manager based on the in-content preferences style.
  • Improved scrolling, graphics, and video playback performance with off-main-thread compositing (Linux only).
  • Graphic blocklist mechanism improved: Firefox version ranges can be specified, limiting the number of devices blocked.
  • Add-on extensions that are not signed by Mozilla will display a warning.
  • NPAPI Plug-in performance improved via asynchronous initialization.
  • Smoother animation and scrolling with hardware vsync (Windows only).
  • JPEG images use less memory when scaled and can be painted faster.
  • Sub-resources can no longer request HTTP authentication, thus protecting users from inadvertently disclosing login data.
  • IndexedDB transactions are now non-durable by default.
  • Implemented AudioBufferSourceNode.detune to modulate playback rate in cents, a logarithmic unit of measure used for musical intervals.
  • Improved Performance tools in the developer tools: Waterfall view, Call Tree view and a Flame Chart view.
  • New rules view tooltip in the Inspector to tweak CSS Filter values.
  • Console API messages from SharedWorker and ServiceWorker are now displayed in web console.
  • New page ruler highlighting tool that displays lightweight horizontal and vertical rules on a page.
  • Inspector now searches across all content frames in a page.
  • Fixed Kannada text that does not display properly in built-in pdf viewer.
40.0.2 Firefox 40.0.2 August 13, 2015 Off-cycle stability update.[413]
  • Enabled API allowing Windows 10 users to open settings dialog.
  • Fixed mozalloc.lib that was missing from the xulrunner package.
  • Fixed a startup crash with some combination of hardware and drivers.
40.0.3 Firefox 40.0.3 August 27, 2015 Off-cycle stability and security update.[414]
  • Disabled the asynchronous plugin initialization.
  • Fixed a segmentation fault in the GStreamer support (Linux only).
  • Fixed a startup crash when using DisplayLink (Windows only).
  • Fixed a regression with some Japanese fonts used in the <input> field.
  • Fixed an issue that the selection in a select combox box using the mouse could be broken on some sites.
  • Fixed an issue that some search partner codes were missing.

End-of-life 40.0.x product line on September 22, 2015.

Firefox 41 41.0a1 Firefox 41.0 Nightly May 11, 2015 First Firefox 41.0 Nightly build.
41.0a2 Firefox 41.0 Developer Edition July 2, 2015 First Firefox 41.0 Developer Edition build.
41.0b1 Firefox 41.0 Beta 1 August 12, 2015 First Firefox 41.0 Beta release.[415]
41.0 Firefox 41.0 September 22, 2015 Official Firefox 41.0 release.[citation needed]
  • Enhanced IME support on Windows (Vista +) using TSF (Text Services Framework).
  • Ability to set a profile picture for your Firefox Account.
  • Firefox Hello now includes instant messaging.
  • SVG images can be used as favicons.
  • Improved box-shadow rendering performance.
  • WebRTC now requires perfect forward secrecy.
  • WARP is disabled on Windows 7.
  • Updates to image decoding process.
  • Support for running animations of 'transform' and 'opacity' on the compositor thread.
  • MessageChannel and MessagePort API enabled by default.
  • Added support for the transform-origin property on SVG elements.
  • CSS Font Loading API enabled by default.
  • Navigator.onLine now varies with actual internet connectivity (Windows and Mac OS X only).
  • Copy/Cut Web content from JavaScript to the OS clipboard with document.execCommand("cut"/"copy").
  • Implemented Cache API for querying named caches that are accessible Window, Worker, and ServiceWorker.
  • Removed support for binary XPCOM components in extensions, use addon SDK "system/child_process" pipe mechanism for native binaries instead.
  • Network requests can be exported in HAR format.
  • Quickly adds new CSS rule with New Rule button in the Inspector.
  • Screenshots a node or element from markup view with the Screenshot Node context menu item.
  • Copies element CSS rule declarations with the Copy Rule Declaration context menu item in the Inspector.
  • Pseudo-Class panel in the Inspector.
  • Fixed an issue where picture element does not react to resize/viewport changes.
41.0.1 Firefox 41.0.1 September 30, 2015 Desktop

Off-cycle stability update.[416]

  • Fixed a startup crash related to Yandex toolbar and Adblock Plus.
  • Fixed potential hangs with Flash plugins.
  • Fixed a regression in the bookmark creation.
  • Fixed a startup crash with some Intel Media Accelerator 3150 graphic cards.
  • Fixed a graphic crash, occurring occasionally on Facebook.
41.0.2 Firefox 41.0.2 October 15, 2015 Off-cycle security update.[417] End-of-life 41.0.x product line on November 3, 2015.
Firefox 42 42.0a1 Firefox 42.0 Nightly July 2, 2015 First Firefox 42.0 Nightly build.
42.0a2 Firefox 42.0 Developer Edition August 14, 2015 First Firefox 42.0 Developer Edition build.
42.0b1 Firefox 42.0 Beta 1 September 23, 2015 First Firefox 42.0 Beta release.[418]
42.0 Firefox 42.0 November 3, 2015 Official Firefox 42.0 release.[citation needed]
  • Private Browsing with Tracking Protection that blocks certain Web elements that could be used to record your behavior across sites.
  • Control Center that contains site security and privacy controls.
  • Indicator added to tabs that play audio with one-click muting.
  • WebRTC improvements:
    • IPV6 support.
    • Preferences for controlling ICE candidate generation and IP exposure.
    • Hooks for extensions to allow/deny createOffer/Answer.
    • Improved ability for applications to monitor and control which devices are used in getUserMedia.
  • Login Manager improvements:
    • Improved heuristics to save usernames and passwords.
    • Editing and showing all logins in line, Copy/Paste usernames/passwords from the Context menu.
    • Migration imports your passwords to Firefox from Google Chrome for Windows and Internet Explorer; import anytime from the Login Manager.
  • Improved performance on interactive websites that trigger a lot of restyles.
  • Implemented ES6 Reflect.
  • Support for ImageBitmap and createImageBitmap().
  • Media Source Extension for HTML5 video available for all sites.
  • Viewing HTML source in a tab.
  • Remote website debugging over WiFi (no USB cable or ADB needed).
  • Asynchronous call stacks now allow web developers to follow the code flow through setTimeout, DOM event handlers, and Promise handlers.
  • Configurable Firefox OS Simulator in WebIDE, to simulate reference devices like phones, tablets, even TVs.
  • CSS filter presets in the Inspector.
  • Ability to save filter presets inside CSS Filter Tooltip.

End-of-life 42.0.x product line on December 15, 2015.

Firefox 43 43.0a1 Firefox 43.0 Nightly August 10, 2015 First Firefox 43.0 Nightly build.
43.0a2 Firefox 43.0 Developer Edition September 22, 2015 First Firefox 43.0 Developer Edition build.
43.0b1 Firefox 43.0 Beta 1 November 3, 2015 First Firefox 43.0 Beta release.[419]
43.0 Firefox 43.0 December 15, 2015 Official Firefox 43.0 release.[citation needed]
  • Private Browsing with Tracking Protection offers choice of blocking additional trackers.
  • Improved API support for m4v video playback.
  • Firefox 64-bit for Windows is now available via the Firefox download page.
  • Users can choose search suggestions from the Awesome Bar.
  • On-screen keyboard displayed on selecting input field on devices running Windows 8 or greater.
  • Firefox Health Report has switched to use the same data collection mechanism as telemetry.
  • Markup view shows indicators for pseudo-classes locked for elements.
  • Binding F1 key to open the settings when the toolbox is focused.
  • New 'Use in Console' context menu item in Inspector to store selected element in a temporary variable.
  • Search button next to overridden CSS properties to find similar properties in the rules view.
  • Ability to filter styles from their property names in the rules view.
  • Stack traces are now shown for exceptions inside the console.
  • Added ability to display server-side logs in the console.
  • Ability to choose resolution for the GCLI screenshot command.
  • Subresource integrity allows developers to make their sites more secure.
  • Network requests in Console now link to Network panel instead of opening in a popup.
  • Unprefixed 'hyphens' property is now supported.
  • WebIDE now has a sidebar-based UI.
  • The 'transform-origin' property is now supported on SVG elements.
  • Animation inspector now displays animations in a timeline.
  • Single-process mode is no longer supported for NPAPI plugins.
  • Fixed an issue in which the Eyedropper tool does not work as expected when page is zoomed.
  • Various security fixes.
43.0.1 Firefox 43.0.1 December 18, 2015 Desktop

Off-cycle stability update.[420]

  • Preparing to use SHA-256 signing certificate for Windows builds, to meet new signing requirement.
43.0.2 Firefox 43.0.2 December 22, 2015 Desktop

Off-cycle security and stability update.[421]

  • Use of a SHA-256 signing certificate for Windows builds, to meet new signing requirements.
43.0.3 Firefox 43.0.3 December 28, 2015 Desktop

Off-cycle stability update.[422]

  • Fixed network issue when using Nvidia's Network Access Manager.
  • On some Windows configurations, improved the decoding of some videos on YouTube.
43.0.4 Firefox 43.0.4 January 6, 2016 Desktop

Off-cycle stability update.[423]

  • Fix for startup crash for users of a third party antivirus tool.
  • Multi-user GNU/Linux download folders can be created.
  • Re-enabled SHA-1 certificates.

End-of-life 43.0.x product line on January 26, 2016.

Firefox 44 44.0a1 Firefox 44.0 Nightly September 21, 2015 First Firefox 44.0 Nightly build.
44.0a2 Firefox 44.0 Developer Edition November 3, 2015 First Firefox 44.0 Developer Edition build.
44.0b1 Firefox 44.0 Beta 1 December 17, 2015 First Firefox 44.0 Beta release.[424]
44.0 Firefox 44.0 January 26, 2016 Official Firefox 44.0 release.[425]
This release has the cookie confirmation dialog removed.[426]
  • Improved warning pages for certificate errors and untrusted connections.
  • Enabled H.264 if system decoder is available.
  • Enabled WebM/VP9 video support on systems that don't support MP4/H.264.
  • In the animation-inspector timeline, lightning bolt icon next to animations running on the compositor thread.
  • Support for the brotli compression format via HTTPS content-encoding.
  • Screenshot commands allow user choice of pixel ratio in Developer Tools.
  • Fixed an issue where Windows XP and Vista screensaver doesn't disable when watching videos.
  • Various security fixes.
  • To support unicode-range descriptor for webfonts, font matching under Linux now uses the same font matching code as other platforms.
  • Use of a SHA-256 signing certificate for Windows builds, to meet new signing requirements.
  • Firefox has removed support for the RC4 decipher.
  • Firefox will no longer trust the Equifax Secure Certificate Authority 1024-bit root certificate or the UTN – DATACorp SGC to validate secure website certificates.
  • Stricter validation of web fonts.
  • On-screen keyboard support temporarily turned off for Windows 8 and Windows 8.1.
  • Right-clicking on a logged object in the console to store it as a global variable on the page.
  • Visual tools for Animation:.
    • View/Edit CSS animation keyframe rules directly in the inspector.
    • Visually modify the cubic-bezier curve that drives the way animations progress through time.
    • Discover and scrub through all CSS animations and transitions playing on the page.
    • Learn more: http://devtoolschallenger.com/.
  • Visual tools for Layout and Styles:
    • Display rulers along the viewport to verify size and position and use the measurement tool to easily detect spacing and alignment problems.
    • Use CSS filters to preview and create real-time effects like drop-shadows, sepia, etc..
    • Learn more: http://devtoolschallenger.com/.
  • New memory tool for inspecting the memory heap.
  • Service Workers API.
  • Built-in JSON reader to intuitively view, search, copy and save data without extensions.
  • A jump to function definitions in the debugger with Cmd-Click.
  • WebSocket Debugging API and add-on.
  • The rule view now displays styles using their authored text, and edits in the rule view are now linked to the style editor.
44.0.1 Firefox 44.0.1 February 8, 2016 Desktop

Off-cycle stability update.[427]

  • Fixed an issue which could lead to the removal of stored passwords under certain circumstances.
  • Allows spaces in cookie names.
  • Requires NSS 3.21.
  • Fixed a crash in cache networking.
  • Fix for using WebSockets in service worker controlled pages.
  • Disabled opus/vorbis audio with H.264.
  • Shipment for the Gecko SDK.
  • Fix for graphics startup crash on GNU/Linux.
44.0.2 Firefox 44.0.2 February 11, 2016 Off-cycle security and stability update.[428]
  • Fixed an issue where Firefox hangs or crashes on startup.

End-of-life 44.0.x product line on March 8, 2016.

Firefox 45 45.0a1 Firefox 45.0 Nightly October 29, 2015 First Firefox 45.0 Nightly build.
45.0a2 Firefox 45.0 Developer Edition December 15, 2015 First Firefox 45.0 Developer Edition build.
45.0b1 Firefox 45.0 Beta 1 January 27, 2016 First Firefox 45.0 Beta release.[429]
45.0 Firefox 45.0 March 8, 2016 Official Firefox 45.0 release.[citation needed]
  • Instant browser tab sharing through Hello.
  • Tabs synced via Firefox Accounts from other devices are now shown in dropdown area of Awesome Bar when searching.
  • Synced Tabs button in button bar.
  • Introduces a new preference (network.dns.blockDotOnion) to allow blocking .onion at the DNS level.
  • Guarani [gn] locale added.
  • URLs containing a Unicode-format Internationalized Domain Name (IDN) are now properly redirected.
  • Various security fixes.
  • Tab Groups (Panorama) feature removed.
  • Ability to filter snapshot output in memory tool.
  • Fine-tuning animations by changing the playback rate of animations in the animation-inspector's timeline.
  • DOMContentLoaded and load events shown in the network monitor timeline.
  • Added Negative url filtering for the network monitor.
  • Support for diffing heap snapshots added to the memory tool.
  • Inspector search now matches results from all content in the page, including subframes.
  • List of animated properties and keyframes is now displayed when clicking on an animation in the animation-inspector’s timeline.
  • Push API support, part of Progressive Web Applications.
  • Support for delivery of a Content Security Policy (CSP) via a meta tag.
  • Web Speech synthesis API.
  • ES6 Classes.
45.0.1 Firefox 45.0.1 March 16, 2016 Off-cycle stability update.[430]
45.0.2 Firefox 45.0.2 April 11, 2016 Off-cycle stability update.[431] End-of-life 45.0.x product line on April 26, 2016.
45.0esr Firefox 45.0esr March 8, 2016 Official Firefox 45.0 Extended Support Release (ESR).
45.0.1esr Firefox 45.0.1esr March 16, 2016 Off-cycle stability update.[430]
  • Fix for a potential performance regression (YouTube for example).
  • Fix for a regression causing search engine settings to be lost in some context.
  • Brings back non-standard jar: URIs to fix a regression in IBM iNotes.
  • Fixed an issue in which XSLTProcessor.importStylesheet was failing when <import> was used.
  • Fix for an issue which could cause the list of search provider to be empty.
  • Fix for a regression when using the location bar.
  • Fix for some loading issues when Accept third-party cookies: was set to Never.
  • Disabled Graphite font shaping library.
45.0.2esr Firefox 45.0.2esr April 11, 2016 Off-cycle stability update.[431]
  • Fix for an issue impacting the cookie header when third-party cookies are blocked.
  • Fix for a web compatibility regression impacting the srcset attribute of the image tag.
  • Fix for a crash impacting the video playback with Media Source Extension.
  • Fix for a regression impacting some specific uploads.
Desktop
  • Fix for a regression with the copy and paste with some old versions of some Gecko applications like Thunderbird.
45.1.0esr Firefox 45.1.0esr April 26, 2016 Regular security and stability update.[432]
45.1.1esr Firefox 45.1.1esr May 3, 2016 Off-cycle stability update.[433]
  • Fixed a build issue when jit is disabled.
  • Fixed add-on signing certificate expiration.
  • Fixed a graphics-related shutdown crash.
45.2.0esr Firefox 45.2.0esr June 7, 2016 Regular security and stability update.[434]
  • Fixed graphics-related crashes.
  • Fixed unicode support for AutoConfig API.
  • Web compatibility fix for addEventListener API.
45.3.0esr Firefox 45.3.0esr August 2, 2016 Regular security and stability update.[435]
45.4.0esr Firefox 45.4.0esr September 20, 2016 Regular security update.[436]
45.5.0esr Firefox 45.5.0esr November 15, 2016 Regular security update.[437]
45.5.1esr Firefox 45.5.1esr November 30, 2016 Off-cycle security update.[438]
45.6.0esr Firefox 45.6.0esr December 13, 2016 Regular security update.[439]
45.7.0esr Firefox 45.7.0esr January 24, 2017 Regular security update.[440]
45.8.0esr Firefox 45.8.0esr March 7, 2017 Regular security update.[441]
45.9.0esr Firefox 45.9.0esr April 19, 2017 Regular security update.[442] End-of-life 45.x.x ESR product line on June 13, 2017.
Firefox 46 46.0a1 Firefox 46.0 Nightly December 15, 2015 First Firefox 46.0 Nightly build.
46.0a2 Firefox 46.0 Developer Edition January 26, 2016 First Firefox 46.0 Developer Edition build.
46.0b1 Firefox 46.0 Beta 1 March 8, 2016 First Firefox 46.0 Beta release.[443]
46.0 Firefox 46.0 April 26, 2016 Official Firefox 46.0 release.
  • Improved security of the JavaScript Just In Time (JIT) Compiler
  • GTK3 integration (GNU/Linux only)
  • Screen reader behavior with blank spaces in Google Docs corrected
  • Corrected rendering for scaled SVGs that use a clip and a mask
  • WebRTC fixes to improve performance and stability
  • Display of dominator trees in Memory tool
  • Allocation and garbage collection pause profiling in the performance panel
  • Launch of responsive mode from the Style Editor @media sidebar
  • Added support for document.elementsFromPoint
  • Added HKDF support for Web Crypto API[citation needed]
46.0.1 Firefox 46.0.1 May 3, 2016 Off-cycle stability update.[444]
  • Fixed add-on signing certificate expiration.
  • Fixed service worker update issue.
  • Fixed a build issue when jit is disabled.
  • Fixed a page loading issue related to antivirus software.
  • Searched a plugin issue for various locales.
  • Limited Sync registration updates.

End-of-life 46.0.x product line on June 7, 2016.

Firefox 47 47.0a1 Firefox 47.0 Nightly January 26, 2016 First Firefox 47.0 Nightly build.
47.0a2 Firefox 47.0 Developer Edition March 8, 2016 First Firefox 47.0 Developer Edition build.
47.0b1 Firefox 47.0 Beta 1 April 27, 2016 First Firefox 47.0 Beta release.[445]
47.0 Firefox 47.0 June 7, 2016 Official Firefox 47.0 release.[citation needed][citation needed]
  • Support for Google’s Widevine CDM on Windows and Mac OS X so streaming services like Amazon Video can switch from Silverlight to encrypted HTML5 video.
  • Enabled VP9 video codec for users with fast machines
  • Embedded YouTube videos now play with HTML5 video if Flash is not installed.
  • Ability to view and search open tabs from your smartphone or another computer in a sidebar
  • Allowed no-cache on back/forward navigations for https resources
  • Latgalu [ltg] locale added.
  • Various security fixes
  • FUEL (Firefox User Extension Library) has been removed. Add-ons relying on it will stop working.
  • The browser.sessionstore.restore_on_demand preference has been reset to its default value (true) to avoid e10s performance problems.
  • The Firefox click-to-activate plugin whitelist has been removed.
  • Web platform changes
  • Ability to view, start, and debug registered Service Workers in the Service Workers developer tool
  • Ability to simulate Push messages in the Service Workers developer tool
  • 'Start' button for service workers in about:debugging to start registered Service Workers
  • Changes that can affect add-on compatibility
  • Added support for ChaCha20/Poly1305 cipher suites
  • Custom user agents supported in Responsive Design Mode
  • Smart multi-line input in the Web Console
  • cuechange events are now available on TextTrack objects
  • WebCrypto: PBKDF2 supports SHA-2 hash algorithms
  • WebCrypto: RSA-PSS signature support
Android
  • Last release to support Android 2.3.x (Gingerbread)
47.0.1 Firefox 47.0.1 June 28, 2016 Off-cycle stability update.[446]
  • Fixed an issue in which Selenium WebDriver may cause Firefox to crash at startup.

End-of-life 47.0.x product line on August 2, 2016.

Firefox 48 48.0a1 Firefox 48.0 Nightly March 8, 2016 First Firefox 48.0 Nightly build.
48.0a2 Firefox 48.0 Developer Edition April 25, 2016 First Firefox 48.0 Developer Edition build.
48.0b1 Firefox 48.0 Beta 1 June 8, 2016 First Firefox 48.0 Beta release.[447]
48.0 Firefox 48.0 August 2, 2016 Official Firefox 48.0 release.[448]
  • Roar for moar protection against harmful downloads! We've got your back.
  • Process separation (e10s) is enabled for some of you. Like it? Let us know and we'll roll it out to more.
  • Add-ons that have not been verified and signed by Mozilla will not load.
  • GNU/Linux fans: Get better Canvas performance with speedy Skia support. Try saying that three times fast.
  • WebRTC embetterments:
    • Delay-agnostic AEC enabled.
    • Full duplex for GNU/Linux enabled.
    • ICE Restart & Update is supported.
    • Cloning of MediaStream and MediaStreamTrack is now supported.
  • Searching for something already in your bookmarks or open tabs? We added super smart icons to let you know.
  • Tab (move buttons) and Shift+F10 (pop-up menus) now behave as they should in Firefox customization mode (Windows only).
  • The media parser has been redeveloped using the Rust programming language.
  • Heyo, Jabra & Logitech C920 webcam users. Fixed WebRTC bugs causing frequency distortions.
  • Improved step debugging on last line of functions.
  • After version 48, SSE2 CPU extensions are going to be required on Windows.
  • Dropped support for MAC OS X 10.6, 10.7 and 10.8.
  • Au revoir to Windows Remote Access Service modem Autodial.
  • WebExtensions support is now considered as stable.
  • Want to move absolute & fixed positioned elements? Now you can with our geometry editor.
  • The memory tool now has a tree map view for your debugging pleasure.
  • We're putting the spotlight on the background. Now you can debug WebExtensions background content scripts and background pages.
  • Content Security Policy (CSP) is now enforced for WebExtensions.
  • Old and busted: Error Console. New hotness: Browser Console for your debugging pleasure.
  • Add-on development just got easier because you can reload them from about:debugging — because we're all about debugging.
  • This theme is hot, hot, hot! Say hi to the Firebug theme for Developer Tools.
  • Expanded network requests from the console panel to view request details in line, so you can see things in context.
  • Workers can now use the Web Crypto API.
48.0.1 Firefox 48.0.1 August 18, 2016 Off-cycle stability update.[449]
  • Fix for an audio regression impacting some major websites.
  • Fix for a top crash in the JavaScript engine.
  • Fix for a startup crash issue caused by Websense.
  • Fix for a different behavior with e10s / non-e10s on <select> and mouse events.
  • Fix for a top crash caused by plugin issues.
  • Fix for an unsigned add-ons issue on Windows.
  • Fix for a shutdown issue.
  • Fix for a crash in WebRTC.
48.0.2 Firefox 48.0.2 August 24, 2016 Off-cycle stability update.[450]
  • Fix for a startup crash issue caused by Websense (Windows only).

End-of-life 48.0.x product line on September 20, 2016.

Firefox 49 49.0a1 Firefox 49.0 Nightly April 25, 2016 First Firefox 49.0 Nightly build.
49.0a2 Firefox 49.0 Developer Edition June 6, 2016 First Firefox 49.0 Developer Edition build.
49.0b1 Firefox 49.0 Beta 1 August 3, 2016 First Firefox 49.0 Beta release.[451]
49.0 Firefox 49.0 September 20, 2016 Official Firefox 49.0 release.[452]
  • Updated Firefox Login Manager to allow HTTPS pages to use saved HTTP logins. It’s one more way Firefox is supporting Let’s Encrypt and helping users transition to a more secure web.
  • Added features to Reader Mode that make it easier on the eyes and the ears.
    • Controls that allow users to adjust the width and line spacing of text.
    • Narrate, which reads the content of a page out loud.
  • Improved video performance for users on systems that support SSSE3 without hardware acceleration.
  • Added context menu controls to HTML5 audio and video that let users loops files or play files at 1.25x speed.
  • Improved performance on OS X systems without hardware acceleration.
  • Improved appearance of anti-aliased OS X fonts.
  • Improvements in about:memory reports for tracking font memory usage.
  • Improved performance on Windows systems without hardware acceleration.
  • Fixed an issue that prevented users from updating Firefox for Mac unless they originally installed Firefox. Now, those users as well as any user with administrative credentials can update Firefox.
  • Ended Firefox for Mac support for OS X 10.6, 10.7, and 10.8.
  • Ended Firefox for Windows support for SSE processors.
  • Removed Firefox Hello.
  • Re-enabled the default for Graphite2 font shaping.
  • Added a Cause column to the Network Monitor to show what caused each network request.
  • Introduced web speech synthesis API.
49.0.1 Firefox 49.0.1 September 23, 2016 Off-cycle stability update.[453]
  • Mitigated a startup crash issue caused by Websense (Windows only).
49.0.2 Firefox 49.0.2 October 20, 2016 Off-cycle security and stability update.[454]
  • Asynchronous rendering of the Flash plugins is now enabled by default. This should improve performance and reduce crashes for sites that use the Flash plugin.
  • Changed D3D9 default fallback preference to prevent graphical artifacts.
  • Fixed a network issue that prevents some users from seeing the Firefox UI on startup.
  • Fixed a web compatibility issue with Array.prototype.values
  • Fixed a web compatibility issue with file uploads.
  • Diagnostic information on timing for tab switching.
  • Fix for a Canvas filters graphics issue affecting HTML5 apps.

End-of-life 49.0.x product line on November 15, 2016.

Versions 50 through 59[edit]

Note: Dates in the future indicate a scheduled release date; they are subject to change in the event of unanticipated complications.


Former release Former test release Former release – still supported Current supported official release Current supported test release Future official release Future test release Top
Release history
Browser name Version Codename Release date[1] Release type and highlights[t 1]
Firefox 50 50.0a1 Firefox 50.0 Nightly June 6, 2016 First Firefox 50.0 Nightly build.
50.0a2 Firefox 50.0 Developer Edition August 1, 2016 First Firefox 50.0 Developer Edition build.
50.0b1 Firefox 50.0 Beta 1 September 20, 2016 First Firefox 50.0 Beta release.[455]
50.0 Firefox 50.0 November 15, 2016 Official Firefox 50.0 release.[456][citation needed]
  • Playback video on more sites without plugins with WebM EME Support for Widevine on Windows and Mac.
  • Improved performance for SDK extensions or extensions using the SDK module loader.
  • Added download protection for a large number of executable file types on Windows, Mac and Linux.
  • Increased availability of WebGL to more than 98 percent of users on Windows 7 and newer.
  • Added Guarani (gn) locale.
  • Added option to Find in page that allows users to limit search to whole words only.
  • Updates to keyboard shortcuts.
    • Set for a preference to have Ctrl+Tab cycle through tabs in recently used order.
    • View for a page in Reader Mode by using Ctrl+Alt+R (Command+Alt+R on Mac).
  • Various security fixes.
  • Blocked versions of libavcodec older than 54.35.1.
  • Added a built-in Emoji set for operating systems without native Emoji fonts (Windows 8.0 and lower and Linux).
  • Changes for web developers.
Android
  • Added support for HLS videos via player overlay.
  • Simplified the user interface by combining the Recent Tabs and History panels.
50.0.1 Firefox 50.0.1 November 28, 2016 Off-cycle security and stability update.[457]
  • Fixed an issue where Firefox crashes with 3rd party Chinese IME when using IME text.
50.0.2 Firefox 50.0.2 November 30, 2016 Off-cycle security update.[458]
50.1.0 Firefox 50.1.0 December 13, 2016 Regular security update.[459] End-of-life 50.x.x product line on January 24, 2017.
Firefox 51 51.0a1 Firefox 51.0 Nightly August 1, 2016 First Firefox 51.0 Nightly build.
51.0a2 Firefox 51.0 Developer Edition September 19, 2016 First Firefox 51.0 Developer Edition build.
51.0b1 Firefox 51.0 Beta 1 November 16, 2016 First Firefox 51.0 Beta release.[460]
51.0 Firefox 51.0 January 24, 2017 Official Firefox 51.0 release.[461][citation needed]
  • Added support for FLAC (Free Lossless Audio Codec) playback.
  • Improved reliability of browser data sync.
  • An even faster E10s! Tab Switching is better!
  • Added Georgian (ka) and Kabyle (kab) locales.
  • A warning is displayed when a login page does not have a secure connection.
  • Added support for WebGL 2, with advanced graphics rendering features like transform feedback, improved texturing capabilities, and a new sophisticated shading language.
  • Firefox will save passwords even in forms that do not have “submit” events.
  • Improved video performance for users without GPU acceleration for less CPU usage and a better full screen experience.
  • Added a zoom button in the URL bar:
    • Displays percent above or below 100 percent when a user has changed the page zoom setting from the default.
    • Lets users return to the default setting by clicking on the button.
  • Users can view passwords in the save password prompt before saving them.
  • Removed Belarusian (be) locale.
  • Various security fixes.
  • Updated to NSS 3.28.1.
  • Re-enabled E10s support for Russian (ru) locale.
  • Use of 2D graphics library (Skia) for content rendering on Linux.
Android
  • Added Nepali (ne-NP), Bulgarian (bg) and Kabyle (kab) locales.
51.0.1 Firefox 51.0.1 January 26, 2017 Off-cycle security and stability update.[462]
  • Fixed an issue in which multiprocess incompatibility did not correctly register with some add-ons.
  • Fixed an issue in which geolocation was not working on Windows.
51.0.2 Firefox 51.0.2 February 6, 2017 Android

Off-cycle stability update.[463]

  • Fix for a crash caused by an Android library (Palette) on some x86 devices.
51.0.3 Firefox 51.0.3 February 9, 2017 Android

Off-cycle stability update.[464]

  • Fix for a build issue which was causing some crashes on some x86 architectures.

End-of-life 51.0.x product line on March 7, 2017.

Firefox 52 52.0a1 Firefox 52.0 Nightly September 19, 2016 First Firefox 52.0 Nightly build.
52.0a2 Firefox 52.0 Developer Edition November 14, 2016 First Firefox 52.0 Developer Edition build.
52.0b1 Firefox 52.0 Beta 1 January 23, 2017 First Firefox 52.0 Beta release.
52.0b2 Firefox 52.0 Beta 2 January 25, 2017 Second Firefox 52.0 Beta release.[465]
52.0 Firefox 52.0 March 7, 2017 Official Firefox 52.0 release.[466][467]
  • First release to implement WebAssembly.
  • Added support for WebAssembly, an emerging standard that brings near-native performance to Web-based games, apps, and software libraries without the use of plugins.
  • Added automatic captive portal detection, for easier access to Wi-Fi hotspots. When accessing the Internet via a captive portal, Firefox will alert users and open the portal login page in a new tab.
  • Enabled multi-process Firefox for Windows users with touch screens
  • Added user warnings for non-secure HTTP pages with logins. Firefox now displays a “This connection is not secure” message when users click into the username and password fields on pages that don’t use HTTPS.
  • Implemented the Strict Secure Cookies specification which forbids insecure HTTP sites from setting cookies with the "secure" attribute. In some cases, this will prevent an insecure site from setting a cookie with the same name as an existing "secure" cookie from the same base domain.
  • Enhanced Sync to allow users to send and open tabs from one device to another.
  • Improved text input for third-party keyboard layouts on Windows. This will address some keyboard layouts that:
    • have chained dead keys.
    • input two or more characters with a non-printable key or a dead key sequence.
    • input a character even when a dead key sequence failed to compose a character.
  • Removed support for Netscape Plugin API (NPAPI) plugins other than Flash. Silverlight, Java, Acrobat and the like are no longer supported.
  • Removed Battery Status API to reduce fingerprinting of users by trackers.
  • Improved experience for downloads:
    • Notification in the toolbar when a download fails.
    • Quick access to five most recent downloads rather than three.
    • Larger buttons for canceling and restarting downloads.
  • Displaying (but allowing users to override) an “Untrusted Connection” error when encountering SHA-1 certificates that chain up to a root certificate included in Mozilla’s CA Certificate Program. (Note: Firefox continues to permit SHA-1 certificates that chain to manually imported root certificates.)
  • Migrated Firefox users on Windows XP and Windows Vista operating systems to the extended support release (ESR) version of Firefox.
  • When not using Direct2D on Windows, Skia is used for content rendering.
  • Enabled CSS Grid Layout, opening up a world of new possibilities for graphic design.
  • Redesigned Responsive Design Mode to include device selection, network throttling, and more.
  • Improved security for screen sharing, which now shows a preview and no longer requires a whitelisted domain.
Android
  • Reduced APK file size by more than 5 MB for faster download and installation.
  • Display of media controls to pause or resume playback on the Android notification bar. This gives users easy access to controls and allows them to see when audio or video is playing (and consuming mobile data) on Firefox.
52.0.1 Firefox 52.0.1 March 17, 2017 Off-cycle security update.[468]
  • Various security fixes.
52.0.2 Firefox 52.0.2 March 28, 2017 Off-cycle stability update.[469][470]
  • Fixed use of Nirmala UI as fallback font for additional Indic languages.
  • Fix for loading tab icons on session restore.
  • Fix for a crash on startup on Linux.
  • Fix for new installs erroneously not prompting to change the default browser setting.
Android
  • Disabled presentation API to avoid page loading delays.
  • Display of end-of-life message on non-NEON devices.

End-of-life 52.0.x product line on April 19, 2017.

52.0esr Firefox 52.0esr March 7, 2017 Official Firefox 52.0 Extended Support Release (ESR).
52.0.1esr Firefox 52.0.1esr March 17, 2017 Off-cycle security update.[468]
52.0.2esr Firefox 52.0.2esr March 28, 2017 Off-cycle stability update.[469]
52.1.0esr Firefox 52.1.0esr April 19, 2017 Regular security and stability update.[471]
  • Various security, stability, and regression fixes.
52.1.1esr Firefox 52.1.1esr May 5, 2017 Off-cycle security update.[472]
  • Various security fixes.
52.1.2esr Firefox 52.1.2esr May 19, 2017 Off-cycle stability update.[473]
  • Fixed hangs when using a proxy with NTLM authentication.
52.2.0esr Firefox 52.2.0esr June 13, 2017 Regular security and stability update.[474]
  • Various security fixes
  • Improved file type recognition on Windows
52.2.1esr Firefox 52.2.1esr June 29, 2017 Off-cycle stability update.[475]
  • Fixed an issue in which printing text does not work on Windows when Direct2D is disabled

End-of-life 52.x.x ESR product line on June 26, 2018.

Firefox 53 53.0a1 Firefox 53.0 Nightly November 14, 2016 First Firefox 53.0 Nightly build.
53.0a2 Firefox 53.0 Developer Edition January 23, 2017 First Firefox 53.0 Developer Edition build.
53.0a3 Firefox 53.0 Developer Edition January 27, 2017 Second Firefox 53.0 Developer Edition build.
53.0b1 Firefox 53.0 Beta 1 March 7, 2017 First Firefox 53.0 Beta release.[476]
53.0 Firefox 53.0 April 19, 2017 Official Firefox 53.0 release.[477][478]
  • Improved graphics stability for Windows users with the addition of compositor process separation (Quantum Compositor).
  • Two new 'compact' themes available in Firefox, dark and light, based on the Firefox Developer Edition theme.
  • Lightweight themes are now applied in private browsing windows.
  • Reader Mode now displays estimated reading time for the page.
  • Windows 7+ users on 64-bit OS can select 32-bit or 64-bit versions in the stub installer.
  • Various security fixes.
  • Updated the design of site permission requests to make them harder to miss and easier to understand.
  • Windows XP and Vista are no longer supported. XP and Vista users running Firefox 52 will continue to receive security updates on Firefox ESR 52.
  • 32-bit Mac OS X is no longer supported. 32-bit Mac OS X users can switch to Firefox ESR 52 to continue receiving security updates..
  • Updates for Mac OS X are smaller in size compared to updates for Firefox 52.
  • The last few characters of shortened tab titles fade out instead of being replaced by ellipses to keep more of the title visible.
  • Ended Firefox Linux support for processors older than Pentium 4 and AMD Opteron
  • New visual design for audio and video controls.
  • Support for WebM video with alpha, which allows playing videos with transparent backgrounds.
  • Changes for web developers.
Android
  • Right to Left Language Support – Arabic (ar), Urdu (ur), Hebrew (he) and Persian (fa)
  • Users can enable two columns tabs setting in portrait mode.
  • Long press on a search suggestion removes it from browser history.
53.0.1 Firefox 53.0.1 April 27, 2017 Android

Off-cycle stability update.[479]

  • Fixed a rare condition that could prevent opening restored tabs.
  • Fix for accessibility issue with TalkBack.
  • Fix for a crash with the Bluhell Firewall add-on.
53.0.2 Firefox 53.0.2 May 5, 2017 Off-cycle security and stability update.[480]
  • Made form validation errors and date picker panel visible to the user
  • Various security fixes
  • The non-standard showDialog argument to window.find is now ignored.
  • Fix for issues with Android integration.
  • Right-to-left locales will now display the search bar correctly.
  • Prevented video corruption on affected devices.
53.0.3 Firefox 53.0.3 May 19, 2017 Desktop

Off-cycle stability update.[481]

  • Fixed hangs when using a proxy with NTLM authentication.
  • Fixed excessive resource usage from the captive portal detection service.
  • Bumped preloaded security information expiration times.

End-of-life 53.0.x product line on June 13, 2017.

Firefox 54 54.0a1 Firefox 54.0 Nightly January 23, 2017 First Firefox 54.0 Nightly build.
54.0a2 Firefox 54.0 Developer Edition March 6, 2017 First Firefox 54.0 Developer Edition build.

This is the last build that based on "Aurora" build.

54.0b12 Firefox 54.0 Developer Edition May 31, 2017 Second Firefox 54.0 Developer Edition build.

Starting in this version Firefox Developer Edition will be based on the "Beta" build.

54.0b1 Firefox 54.0 Beta 1 April 21, 2017 First Firefox 54.0 Beta release.[482]
54.0 Firefox 54.0 June 13, 2017 Official Firefox 54.0 release.[483][484]
  • Simplified the download button and download status panel.
  • Added support for multiple content processes (e10s-multi).
  • Added Burmese (my) locale.
  • Moved the mobile bookmarks folder to the main bookmarks menu for easier access.
  • Added ability to create and save custom devices in Responsive Design Mode.
  • Additional changes for web developers.
Android
  • Added Bulgarian (bg) and Kabyle (kab) locales.
  • Fixed formatting for right-to-left languages, including formatting of preference names in about:config.
  • Improved audio and video playback in the browser.
  • Improved bookmarks sync performance.
54.0.1 Firefox 54.0.1 June 29, 2017 Off-cycle stability update.[485][486]
  • Fix for a display issue of tab title
  • Fix for a display issue of opening new tab
  • Fix for a display issue when opening multiple tabs
  • Fix for a tab display issue when downloading files
  • Fix for a PDF printing issue
  • Fix for a Netflix issue on Linux
Android
  • Fix for an inconsistent locale display issue
  • Fix for a crash in tabs tray menu
  • Fix for issues with navigation

End-of-life 54.0.x product line on August 8, 2017.

Firefox 55 55.0a1 Firefox 55.0 Nightly March 6, 2017 First Firefox 55.0 Nightly build.
55.0b1 Firefox 55.0 Developer Edition June 14, 2017 First Firefox 55.0 Developer Edition build.[487]
55.0b1 Firefox 55.0 Beta 1 June 14, 2017 First Firefox 55.0 Beta release.[487]
55.0 Firefox 55.0 August 8, 2017 Official Firefox 55.0 release.[488] End-of-life 55.0.x product line on September 26, 2017.
Firefox 56 56.0a1 Firefox 56.0 Nightly June 12, 2017 First Firefox 56.0 Nightly build.[488]
56.0b1 Firefox 56.0 Developer Edition August 7, 2017 First Firefox 56.0 Developer Edition build.[488]
56.0b1 Firefox 56.0 Beta 1 August 7, 2017 First Firefox 56.0 Beta release.[488]
56.0 Firefox 56.0 September 26, 2017 Official Firefox 56.0 release.[488] End-of-life 56.0.x product line on November 14, 2017.
Firefox 57 57.0a1 Firefox 57.0 Nightly August 7, 2017 First Firefox 57.0 Nightly build.[488]
57.0b1 Firefox 57.0 Developer Edition September 25, 2017 First Firefox 57.0 Developer Edition build.[488]
57.0b1 Firefox 57.0 Beta 1 September 25, 2017 First Firefox 57.0 Beta release.[488]
57.0 Firefox 57.0 November 14, 2017 Official Firefox 57.0 release.[488] End-of-life 57.0.x product line on January 16, 2018.
Firefox 58 58.0a1 Firefox 58.0 Nightly September 25, 2017 First Firefox 58.0 Nightly build.[488]
58.0b1 Firefox 58.0 Developer Edition November 13, 2017 First Firefox 58.0 Developer Edition build.[488]
58.0b1 Firefox 58.0 Beta 1 November 13, 2017 First Firefox 58.0 Beta release.[488]
58.0 Firefox 58.0 January 16, 2018 Official Firefox 58.0 release.[488] End-of-life 58.0.x product line on March 6, 2018.
Firefox 59 59.0a1 Firefox 59.0 Nightly November 13, 2017 First Firefox 59.0 Nightly build.[488]
59.0b1 Firefox 59.0 Developer Edition January 15, 2018 First Firefox 59.0 Developer Edition build.[488]
59.0b1 Firefox 59.0 Beta 1 January 15, 2018 First Firefox 59.0 Beta release.[488]
59.0 Firefox 59.0 March 6, 2018 Official Firefox 59.0 release.[488] End-of-life 59.0.x product line on May 1, 2018.

Versions 60 through 69[edit]

Note: Dates in the future indicate a scheduled release date; they are subject to change in the event of unanticipated complications.


Former release Former test release Former release – still supported Current supported official release Current supported test release Future official release Future test release Top
Release history
Browser name Version Codename Release date[1] Release type and highlights[t 1]
Firefox 60 60.0a1 Firefox 60.0 Nightly January 15, 2018 First Firefox 60.0 Nightly build.[488]
60.0b1 Firefox 60.0 Developer Edition March 5, 2018 First Firefox 60.0 Developer Edition build.[488]
60.0b1 Firefox 60.0 Beta 1 March 5, 2018 First Firefox 60.0 Beta release.[488]
60.0 Firefox 60.0 May 1, 2018 Official Firefox 60.0 release.[488] End-of-life 60.0.x product line on June 26, 2018.
Firefox 61 61.0a1 Firefox 61.0 Nightly March 5, 2018 First Firefox 61.0 Nightly build.[488]
61.0b1 Firefox 61.0 Developer Edition April 30, 2018 First Firefox 61.0 Developer Edition build.[488]
61.0b1 Firefox 61.0 Beta 1 April 30, 2018 First Firefox 61.0 Beta release.[488]
61.0 Firefox 61.0 June 26, 2018 Official Firefox 61.0 release.[488] End-of-life 61.0.x product line on August 21, 2018.
Firefox 62 62.0a1 Firefox 62.0 Nightly April 30, 2018 First Firefox 62.0 Nightly build.[488]
62.0b1 Firefox 62.0 Developer Edition June 25, 2018 First Firefox 62.0 Developer Edition build.[488]
62.0b1 Firefox 62.0 Beta 1 June 25, 2018 First Firefox 62.0 Beta release.[488]
62.0 Firefox 62.0 August 21, 2018 Official Firefox 62.0 release.[488] End-of-life 62.0.x product line on October 16, 2018.
Firefox 63 63.0a1 Firefox 63.0 Nightly June 25, 2018 First Firefox 63.0 Nightly build.[488]
63.0b1 Firefox 63.0 Developer Edition August 20, 2018 First Firefox 63.0 Developer Edition build.[488]
63.0b1 Firefox 63.0 Beta 1 August 20, 2018 First Firefox 63.0 Beta release.[488]
63.0 Firefox 63.0 October 16, 2018 Official Firefox 63.0 release.[488] End-of-life 63.0.x product line on November 27, 2018.
Firefox 64 64.0a1 Firefox 64.0 Nightly August 20, 2018 First Firefox 64.0 Nightly build.[488]
64.0b1 Firefox 64.0 Developer Edition October 15, 2018 First Firefox 64.0 Developer Edition build.[488]
64.0b1 Firefox 64.0 Beta 1 October 15, 2018 First Firefox 64.0 Beta release.[488]
64.0 Firefox 64.0 November 27, 2018 Official Firefox 64.0 release.[488]
Firefox 65 65.0a1 Firefox 65.0 Nightly October 15, 2018 First Firefox 65.0 Nightly build.[488]
65.0b1 Firefox 65.0 Developer Edition November 26, 2018 First Firefox 65.0 Developer Edition build.[488]
65.0b1 Firefox 65.0 Beta 1 November 26, 2018 First Firefox 65.0 Beta release.[488]
65.0 Firefox 65.0 November 27, 2018 Official Firefox 65.0 release.[488]
Firefox 66 66.0a1 Firefox 66.0 Nightly November 26, 2018 First Firefox 66.0 Nightly build.[488]
66.0b1 Firefox 66.0 Developer Edition November 26, 2018 First Firefox 66.0 Developer Edition build.[488]
66.0b1 Firefox 66.0 Beta 1 November 26, 2018 First Firefox 66.0 Beta release.[488]
Former release Former test release Former release – still supported Current supported official release Current supported test release Future official release Future test release Top

CPU architectures[edit]

x86 family[edit]

Native 64-bit builds are officially supported on Linux, macOS, and Windows (since version 42).[489][citation needed]

Mozilla made Firefox for 64-bit Linux a priority with the release of Firefox 4, labeling it as tier 1 priority.[citation needed][490] Since being labeled tier 1, Mozilla has been providing official 64-bit releases for its browser for Linux.[491][492] Vendor-backed 64-bit support has existed for Linux distributions such as Novell-Suse Linux, Red Hat Enterprise Linux, and Ubuntu prior to Mozilla's support of 64-bit, even though vendors were faced with the challenge of having to turn off the 64-bit JIT compiler due to its instability prior to Firefox 4.[493][494]

The official releases of Firefox for macOS are universal builds that include both 32-bit and 64-bit versions of the browser in one package, and have been this way since Firefox 4. A typical browsing session uses a combination of the 64-bit browser process and a 32-bit plugin process, because some popular plugins still are 32-bit.[495] As of April 19, 2017, Firefox 53 has dropped support for 32-bit macOS.[496]

The 32-bit and 64-bit versions of Windows can be used to run 32-bit Firefox.[citation needed] In late 2012, Mozilla announced 64-bit Windows builds would be stopped[497] but later reversed the decision.[498] As of April 2015, 64-bit Windows builds are available as 38.0 Beta[499] and newer. 64-bit builds for Windows are officially supported as of November 2015 with the release of Firefox 42. All NPAPI plugins except Adobe Flash Player are blacklisted and unsupported on both 32 and 64-bit versions.[500]

Other CPU architectures[edit]

Besides x86, Firefox also supported other CPU architectures including ARMv7, SPARC, PowerPC, and 68k on different tiers.[501] Mozilla terminated support for PowerPC-based Macintosh computers with Firefox 3.6, but a third-party project known as TenFourFox ported several newer versions of Firefox, the latest being based on Firefox 45 ESR.

Mozilla Firefox timeline[edit]


Security Bug Bounty Program[edit]

In the Mozilla Security Bug Bounty Program, a bounty payment is offered to those reporting hitherto unknown security bugs. The Mozilla Foundation say that this is "designed to encourage security research in Mozilla software and to reward those who help us".[502]

See also[edit]

Notes[edit]

  1. ^ a b c d e f g h Features highlighted may exist in beta stages prior to an official release build of the immediate version, or in an incremental minor version build prior to the last one.
  2. ^ There was no version 3.6.1.
  3. ^ There was no version 3.6.5.
  4. ^ Builds of version 5.0b4 were created, but not released.
  5. ^ Builds of version 7.0b3 were created, but not released.

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