History of Firefox

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The history of the Firefox browser has its origins in an experimental branch of the Mozilla browser that was created by Dave Hyatt and Blake Ross. Beginning under the name Phoenix in September 2002, the browser was renamed Firebird in April 2003, and then Firefox in the following year. Firefox 1.0 was released on November 9, 2004, Firefox 1.5 on November 29, 2005, and Firefox 2.0 on October 24, 2006. The third major version of the browser, Firefox 3.0, was released on June 17, 2008, with Firefox 3.5 and Firefox 3.6 following on June 30, 2009, and January 21, 2010, respectively. Firefox 4 was released on March 22, 2011. Starting with version 5.0 in June 2011, a rapid-release cycle was put into effect, resulting in a new major-version release every six weeks. This schedule largely held until late 2016, when the release cycles became longer and more varied. As of 2019, major versions are being planned seven weeks apart.

Extended Support Release (ESR) versions of the browser became available starting in January 2012, with Firefox 10.0 ESR. Each ESR version was supported through nine rapid-release cycles for a total of 54 weeks. Updates to ESR versions of the browser were limited to security and stability fixes with no features being added or removed until the next ESR version. Initially scheduled for every seventh major version, the ESR release program continued with 17.0, 24.0, 31.0, 38.0 and 45.0. With Firefox 52.0 ESR, the release schedule for ESR versions changed to every eighth major version, with support extending to 76 weeks; under this scheme ESR versions continued with version 60.0, released on May 9, 2018.

As of April 18, 2019, the latest major version is Firefox 66, which was released on March 19, 2019. The current supported official releases are Firefox 66.0.3 and Firefox 60.6.1 ESR. Future development is continuing with Firefox 67.0 and onwards. The next major ESR release will be Firefox 68.0 ESR.

Contents

Naming[edit]

Phoenix 0.1, the first official release

The project that became Firefox began as an experimental branch of the Mozilla Suite called m/b (or mozilla/browser). After it was sufficiently developed, binaries for public testing appeared in September 2002 under the name Phoenix. This name carried the implication of the mythical firebird that rose triumphantly from the ashes of its dead predecessor, in this case Netscape Navigator which lost the "First browser war" to Microsoft's Internet Explorer. The name Mozilla began as the internal codename for the original 1994 Netscape Navigator browser aiming to displace NCSA Mosaic as the world's most popular web browser. The name for this would-be "Mosaic killer" was meant to evoke the building-crushing Godzilla.[1] The name Mozilla was revived as the 1998 open sourcing spinoff organization from Netscape.

The name Phoenix remained until April 14, 2003, when it was changed because of a trademark dispute with the BIOS manufacturer Phoenix Technologies (which produces a BIOS-based browser called Phoenix FirstWare Connect). The new name, Firebird, met with mixed reactions, particularly as the Firebird database server already carried the name. In response, the Mozilla Foundation stated that the browser should always bear the name Mozilla Firebird to avoid confusion with the database software.

Due to continuing pressure from the Firebird community,[2] on February 9, 2004 the project was renamed again to Mozilla Firefox.[3] The name "Firefox" (a reference to the red panda)[4] was chosen for its similarity to "Firebird", and its uniqueness in the computing industry. To ensure that no further name changes would be necessary, the Mozilla Foundation began the process of registering Firefox[5] as a trademark with the United States Patent and Trademark Office in December 2003. This trademark process led to a delay of several months in the release of Firefox 0.8 when the foundation discovered that Firefox had already been registered as a trademark in the UK[6] for Charlton Company software.[7] The situation was resolved when the foundation was given a license to use Charlton's European trademark.

Early versions[edit]

Early description of what cookies are in Preferences window of Mozilla Firefox 0.9.3. This description was soon dropped in later versions.

Hyatt, Ross, Hewitt and Chanial[8] developed their browser to combat the perceived software bloat of the Mozilla Suite (codenamed, internally referred to, and continued by the community as SeaMonkey), which integrated features such as IRC, mail, news, and WYSIWYG HTML editing into one internet suite.

Firefox retains the cross-platform nature of the original Mozilla browser, using the XUL user interface markup language. The use of XUL makes it possible to extend the browser's capabilities through the use of extensions and themes. The development and installation processes of these add-ons raised security concerns, and with the release of Firefox 0.9, the Mozilla Foundation opened a Mozilla Update website containing "approved" themes and extensions. The use of XUL sets Firefox apart from other browsers, including other projects based on Mozilla's Gecko layout engine and most other browsers, which use interfaces native to their respective platforms (Galeon and Epiphany use GTK+, K-Meleon uses MFC, and Camino uses Cocoa). Many of these projects started before Firefox, and probably served as inspiration.

On February 5, 2004, AMS, a business and IT consulting company, categorized Mozilla Firefox (then known as Firebird) as a "Tier 1" ("Best of Breed") open-source product, considering it technically strong and virtually risk-free.[9]

Phoenix 0.1 to Firebird 0.7[edit]

May 15, 2003 was the publication day of Phoenix 0.1.[10][11][12][13][14][15][16] October 26, 2003 was the publication day of Firebird 0.7.[17]

Version 1.0[edit]

Firefox 1.0, the first release targeted for general public

Firefox 1.0 was released on November 9, 2004.[29] The launch of version 1.0 was accompanied by "a respectable amount of pre-launch fervor"[30] including a fan-organized campaign to run a full-page ad in The New York Times.

Although the Mozilla Foundation had intended to make the Mozilla Suite obsolete and replace it with Firefox, the Foundation continued to maintain the suite until April 12, 2006[31] because it had many corporate users and was bundled with other software. The Mozilla community (as opposed to the Foundation) continues to release new versions of the suite, using the product name SeaMonkey to avoid confusion with the original Mozilla Suite.

Version 1.5[edit]

Updated options window introduced in Firefox 1.5
"Deer Park", the codename of the Firefox 1.1 and 1.5 Alphas, did not include Firefox branding.

Firefox 1.5 was released on November 30, 2005. Originally, it was planned to have a version 1.1 at an earlier date as the new Firefox version after 1.0, with development on a later version (1.5) in a separate development branch, but during 2005 both branches and their feature sets were merged (the Mozilla Foundation abandoned the 1.1 release plan after the first two alpha builds), resulting in an official release date between the original dates planned for both versions.

Version 1.5 implemented a new Mac-like options interface, the subject of much criticism from Microsoft Windows and Linux users, with a "Sanitize" action to allow someone to clear their privacy-related information without manually clicking the "Clear All" button. In Firefox 1.5, a user could clear all privacy-related settings simply by exiting the browser or using a keyboard shortcut, depending on their settings. Moreover, the software update system was improved (with binary patches now possible). There were also improvements in the extension management system, with a number of new developer features. In addition, Firefox 1.5 had preliminary SVG 1.1 support.[47]

Behind the screens, the new version resynchronized the code base of the release builds (as opposed to nightly builds) with the core "trunk", which contained additional features not available in 1.0, as it branched from the trunk around the 0.9 release. As such, there was a backlog of bug fixes between 0.9 and the release of 1.0, which were made available in 1.5.

There were also changes in operating system support. As announced on 23 June 2005 by the Mozilla Foundation, Firefox 1.1, which later became 1.5, and other new Mozilla products did no longer support Mac OS X v10.1, in order to improve the quality of Firefox releases on Mac OS X v10.2 and above. Firefox 1.5.0.12 was the final version supported on Windows 95.

Alpha builds of Firefox 1.5 (id est, 1.1a1 and 1.1a2) did not carry Firefox branding; they were labelled "Deer Park" (which was Firefox 1.5's internal codename) and contained a different program icon. This was done to dissuade end-users from downloading preview versions, which are intended for developers only.

Version 2[edit]

Mozilla Firefox 2.0.0.12 running on Ubuntu

On October 24, 2006, Mozilla released Firefox 2. This version included updates to the tabbed browsing environment, the extensions manager, the GUI (Graphical User Interface), and the find, search and software update engines. It also implemented a new session restore feature, inline spell checking, and an anti-phishing feature which was implemented by Google as an extension[65][66] and later merged into the program itself.[67]

In December 2007, Firefox Live Chat was launched. It allowed users to ask volunteers questions through a system powered by Jive Software, with guaranteed hours of operation and the possibility of help after hours.[68]

Firefox 2.0.0.20 was the final version that could run under an unmodified installation of Windows NT 4.0, Windows 98, and Windows ME.[69] Subsequently, Mozilla Corporation announced it would not develop new versions of Firefox 2 after the 2.0.0.20 release, but continued Firefox 2 development as long as other programs, such as Thunderbird mail client, depended on it. The final internal release was 2.0.0.22, released in late April 2009.

Version 3[edit]

Mozilla Firefox 3.0 on Ubuntu

Firefox 3 was released on June 17, 2008,[96] by the Mozilla Corporation. Firefox 3 uses version 1.9 of the Mozilla Gecko layout engine for displaying web pages. This version fixes many bugs, improves standard compliance, and implements new web APIs.[97] Other new features include a redesigned download manager, a new "Places" system for storing bookmarks and history, and separate themes for different operating systems. Tabbed browsing was more popularised in this version. The final version under 3.0 is Firefox 3.0.19.

Development stretches back to the first Firefox 3 beta (under the codename 'Gran Paradiso'[98]) which had been released several months earlier on November 19, 2007,[99] and was followed by several more beta releases in spring 2008 culminating in the June release.[100] Firefox 3 had more than 8 million unique downloads the day it was released, setting a Guinness World Record.[101]

Version 3.5[edit]

Firefox 3.5 on Ubuntu

Version 3.5, codenamed Shiretoko,[134] adds a variety of new features to Firefox. Initially numbered Firefox 3.1, Mozilla developers decided to change the numbering of the release to 3.5 in order to reflect a significantly greater scope of changes than originally planned.[135] The final release was on June 30, 2009. The changes included much faster performance thanks to an upgrade to SpiderMonkey JavaScript engine called TraceMonkey and rendering improvements,[136] and support for the <video> and <audio> tags as defined in the HTML5 specification, with a goal to offer video playback without being encumbered by patent problems associated with many video technologies.[137] Cross-site XMLHttpRequests (XHR), which can allow for more powerful web applications and an easier way to implement mashups, are also implemented in 3.5.[138] A new global JSON object contains native functions to efficiently and safely serialize and deserialize JSON objects, as specified by the ECMAScript 3.1 draft.[139] Full CSS 3 selector support has been added. Firefox 3.5 uses the Gecko 1.9.1 engine, which includes a few features that were not included in the 3.0 release. Multi-touch trackpad support was also added to the release, including gesture support like pinching for zooming and swiping for back and forward.[140] Firefox 3.5 also features an updated logo.[141]

Version 3.6[edit]

Version 3.6, released on January 21, 2010, uses the Gecko 1.9.2 engine and includes several interface improvements, such as "personas". This release was referred to as 3.2 before 3.1 was changed to 3.5. The codename for this version was Namoroka. This is the last major, official version to run on PowerPC-based Macintoshes.

One minor update to Firefox 3.6, version 3.6.4 (code-named Lorentz) is the first minor update to make non-intrusive changes other than minor stability and security fixes.[164] It adds Out of Process Plugins (OOPP), which runs plugins in a separate process, allowing Firefox to recover from plugin crashes.

Firefox 3.6.6 lengthens the amount of time a plugin is allowed to be unresponsive before the plugin quits.[165]

Support for Firefox 3.6 ended on April 24, 2012.[166]

Version 4.0[edit]

Firefox 4.0 displaying Wikipedia on Windows 7

Firefox 3.7 (Gecko 1.9.3) Alpha 1 was released on February 10, 2010.[201][202] Alpha 2 was released on March 1, 2010, Alpha 3 on March 17, 2010, Alpha 4 on April 12, 2010, and Alpha 5 on June 16, 2010.

The version number was changed to 4.0 (and Gecko's was changed to 2.0) starting with Beta 1, released on July 6, 2010.

Beta 2 was released on July 27, 2010, Beta 3 on August 11, 2010, Beta 4 on August 24, 2010, Beta 5 on September 7, 2010, and Beta 6 (a chemspill release) on September 14, 2010.

After major delays, Beta 7 was finally released on November 10, 2010. Beta 7 was followed by Beta 8, released on December 21, 2010. Beta 9 was released on January 14, 2011, Beta 10 on January 25, 2011, Beta 11 on February 8, 2011, and Beta 12 on February 12, 2011.

Firefox then moved into the RC stage.[203] The final version of Firefox 4 was released on March 22, 2011.[18]

Version 4 brought a new user interface and is said to be faster.[204] Early mockups of the new interface on Windows, Mac OS X, and Linux were first made available in July 2009.[205][206][207] Other new features included improved notifications, tab groups, application tabs, a redesigned add-on manager, integration with Firefox Sync, and support for multi-touch displays.[208][209][210][211][212]

On October 13, 2006, Brendan Eich, Mozilla's then Chief Technology Officer, wrote about the plans for "Mozilla 2", referring to the most comprehensive iteration (since its creation) of the overall platform on which Firefox and other Mozilla products run.[213] Most of the objectives were gradually incorporated into Firefox through versions 3.0, 3.5, and 3.6. The largest changes, however, were planned for Firefox 4.

Firefox 4 was based on the Gecko 2.0 engine, which added or improved support for HTML5, CSS3, WebM, and WebGL.[214][215] It also included a new JavaScript engine (JägerMonkey) and better XPCOM APIs.[216]

Rapid release[edit]


Firefox.svg
Market Share Overview
According to StatCounter data

March 2019[238]

Browser % of Fx % of Total
Old version, no longer supported: Firefox 2
Old version, no longer supported: Firefox 3.x
Old version, no longer supported: Firefox 4 0.21% 0.01%
Old version, no longer supported: Firefox 59
Old version, no longer supported: Firefox 1016
Old version, no longer supported: Firefox 1723
Old version, no longer supported: Firefox 2430
Old version, no longer supported: Firefox 3137 0.43% 0.02%
Old version, no longer supported: Firefox 3844 0.85% 0.04%
Old version, no longer supported: Firefox 4551 4.06% 0.19%
Old version, no longer supported: Firefox 5259 8.33% 0.39%
Older version, yet still supported: Firefox 60
Firefox ESR 60
3.85% 0.18%
Old version, no longer supported: Firefox 61 0.64% 0.03%
Old version, no longer supported: Firefox 62 0.64% 0.03%
Old version, no longer supported: Firefox 63 0.85% 0.04%
Old version, no longer supported: Firefox 64 1.92% 0.09%
Old version, no longer supported: Firefox 65 58.12% 2.72%
Current stable version: Firefox 66 16.67% 0.78%
Future release: Firefox 67 0.64% 0.03%
All variants[239] 100% 4.68%

In April 2011, the development process was split into several "channels", each working on a build in a different stage of development. The most recent available build is called "Nightly Builds" and offers the latest, untested features and updates. The "Aurora" build is up to six weeks behind "Nightly" and offers functionality that has undergone basic testing. As of version 35, the "Aurora" channel has been renamed to the "Developer Edition" channel.[240][241] The "Beta" channel is up to six weeks behind the "Aurora" build, for up to about twelve week period compared to the most recent "Nightly" build. The "Beta" channel provides improved stability over the "Nightly" builds and is the first development milestone that has the "Firefox" logo. "Release" is the current official version of Firefox.

New releases are planned to occur at six-week intervals.[242] The stated aim of this faster-paced process is to get new features to users faster.[243] This accelerated release cycle was met with criticism by users, as it often broke add-on compatibility,[244] as well as those who believe Firefox was simply trying to increase its version number to compare with other browsers such as Google Chrome.[245]

Version 5[edit]

Firefox 5 was released on June 21, 2011,[246] three months after the major release of Firefox 4. Firefox 5 is the first release in Mozilla's new rapid release plan, matching Google Chrome's rapid release schedule and rapid version number increments.[247] Version 5 significantly improved the speed of web-related tasks, such as loading pages with combo boxes or MathML. Mozilla also integrated the HTML5 video WebM standard into the browser, allowing playback of WebM video.[248]

Version 6[edit]

Mozilla released its Mozilla Firefox 6.0 on August 16, 2011. The update brought: permissions manager, new address bar highlighting (the domain name is black while the rest of the URL is gray[249]), streamlining the look of the site identity block, quicker startup time, a ScratchPad JavaScript compiler, and many other new features. This update also brought the infamous feature that JavaScript entered in the address bar does not run.[250]

Version 7[edit]

Firefox 7, released September 27, 2011, uses as much as 50% less RAM than Firefox 4 as a result of the MemShrink project to reduce Firefox memory usage.[251][252][253] Mozilla Firefox 7.0.1 was released a few days later, fixing a rare, but serious, issue with add-ons not being detected by the browser.[254] Some URLs are trimmed in the address bar, so the "http://" scheme no longer appears, but "https://" is still displayed. Trailing slashes on domains are also hidden, for example: https://www.example.org/ becomes https://www.example.org.[249][255]

Version 8[edit]

Firefox 8 was released on November 8, 2011. Firefox 8 verified that users really wanted any previously installed add-ons. Upon installation, a dialog box prompted users to enable or disable the add-ons. Add-ons installed by third-party programs were disabled by default, but user-installed add-ons were enabled by default. Mozilla judged that third-party-installed add-ons were problematic, taking away user control, lagging behind on compatibility and security updates, slowing down Firefox startup and page loading time, and cluttering the interface with unused toolbars.[256]

Version 9[edit]

Firefox 9 was released on December 20, 2011, version 9.0.1 was released a day later. Firefox 9 includes various new features such as Type Inference, which boosts JavaScript performance up to 30%, 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 font-stretch, improved support for text-overflow, improved standards support for HTML5, MathML, and CSS, and fixed several security problems. It also features a large list of bug fixes.[257]

Rapid release with ESR[edit]

In January 2012, the Mozilla Foundation announced the availability of an Extended Support Release (ESR) version of Firefox.[277] In addition to the "release", "beta", and "aurora" update channels the ESR versions form the "esr" update channel.

Firefox ESR is intended for groups who deploy and maintain the desktop environment in large organizations such as universities and other schools, county or city governments and businesses. During the extended cycle, no new features will be added to a Firefox ESR; only high-risk/high-impact security vulnerabilities or major stability issues will be corrected.[278]

An ESR includes continuity of support through 9 normal Firefox rapid release cycles (54 weeks), with the final 2 cycles overlapping the next version. ESR versions will jump from 10 to 17, then to 24 etc.[278]

Every six weeks when a new mainstream Firefox release is made under the rapid release cycle, a corresponding security update would also be released for the then-current ESR version. For example, ESR 10.0.1 would be expected to be released at the same time as Firefox 11, ESR 10.0.2 at the same time as Firefox 12. Security updates for ESR versions are also released when out-of-band security updates are made available for mainstream Firefox releases, for example ESR 10.0.10 corresponds with Firefox 16.0.2. At Firefox 17 and Firefox 18, there would be two ESR versions supported. Respectively, ESR 10.0.11 and ESR 17.0.0; ESR 10.0.12 and ESR 17.0.1. Finally, when Firefox reaches 19.0, ESR 10 would go end-of-life alongside the release of ESR 17.0.2. The cycle repeats again.

After the end-of-life with ESR 10.0.12 the Firefox Updater suggested to update to ESR 17.0.x on supported platforms.

The numbering scheme changed somewhat starting with ESR 24.0.0 series. The first minor version number increments on regularly scheduled six-week release cycle, and the second minor version number increments when unscheduled off-cycle releases are necessary. For example, ESR 24.1.0 was released at the same time as 25.0.0, ESR 24.1.1 was released at the same time as 25.0.1, and ESR 24.2.0 was released at the same time as 26.0.0.[279]

Versions 10–16[edit]

Version 10 (ESR)[edit]

Style Inspector

Firefox 10 and Firefox ESR 10 were released on January 31, 2012. It is the first official extended support release. Firefox 10 hides the forward arrow button until there is a website to go forward to, or it is manually activated.[280] Firefox 10 adds a Full Screen API and improved WebGL performance.[281]

Firefox 10 assumed all add-ons were compatible with version 10, as long as they are written for at least Firefox 4. The add-on developer is able to alert Mozilla that the add-on is incompatible, overriding compatibility with version 10 or later. This new rule also does not apply to themes.[282]

Firefox 10 added the CSS Style Inspector to the Page Inspector, which allow users to check out a site's structure and edit the CSS without leaving the browser.[283]

Firefox 10 added support for CSS 3D Transforms and for anti-aliasing in the WebGL standard for hardware-accelerated 3D graphics. These updates mean that complex site and Web app animations will render more smoothly in Firefox, and that developers can animate 2D objects into 3D without plug-ins.[281]

Version 11[edit]

3D Page Inspector
Firefox for Ubuntu

Firefox 11 was released on March 13, 2012. Firefox 11 introduced many new features, including migration of bookmarks and history from Google Chrome,[284] SPDY integrated services, Page Inspector Tilt (3D View), Add-on Sync, redesigned HTML5 video controls, and the Style Editor (CSS).[285] The update also fixed many bugs, and improved developer tools.[286]

Version 12[edit]

Firefox 12 was released on April 24, 2012. Firefox 12 introduced few new features, but it made many changes and laid the ground work for future releases. Firefox 12 for Windows added the Mozilla Maintenance Service which can update Firefox to a newer version without UAC prompt.[287] It also added line numbers in the "Page Source" and centered find in page results. There were 89 improvements to Web Console, Scratchpad, Style Editor, Page Inspector, Style Inspector, HTML view and Page Inspector 3D view (Tilt).[288] Many bugs were fixed, as well as many other minor under-the-hood changes.[289][290] Firefox 12 is the final release to support Windows 2000 and Windows XP RTM & SP1.[291][292]

Version 13[edit]

Home tab page

Firefox 13 was released on June 5, 2012.[242] Firefox 13 adds and updates several features, such as an updated new tab[293] and home tab page.[294] The updated new tab page is a feature similar to the Speed Dial already present in Opera, Google Chrome, Apple Safari, and Internet Explorer. The new tab page will display nine of the user's most visited websites, along with a cached image.

In addition to the updated new tab and home tab page, Mozilla has added a user profile cleaner/reset, reduced hang times, and implemented tabs on demand.[295] The user profile cleaner/reset provides a way for users to fix Firefox errors and glitches that may occur.[296] Mozilla's tabs on demand restores tabs that were open in the previous session, but will keep the tabs unloaded until the user requests to view the page.[297]

Starting with this version, Windows support was exclusively for Windows XP SP2/SP3, Windows Vista, and Windows 7.

Version 14[edit]

Firefox 14.0 for Android was released on June 26, 2012, just outside the regular release schedule of the web browser.[242][298] In order to sync the version numbers of the desktop and mobile version of Firefox, Mozilla decided to release Firefox 14.0.1 for mobile and desktop on July 17, 2012, instead of Firefox 14.0 for the desktop and Firefox 14.0.1 for mobile clients.[298]

A new hang detector (similar to how Mozilla currently collects other data) allows Mozilla to collect, analyze, and identify the cause of the browser freezing/hanging. Mozilla will use this information to improve the responsiveness of Firefox for future releases.[299]

In addition to tackling freezing and not-responding errors that occur because of Firefox, Mozilla implemented opt-in activation for plugins such as Flash and Java. Mozilla wants to reduce potential problems that could arise through the unwanted use of third-party applications (malware, freezing, etc.).[300]

URL complete will suggest the website that Firefox believes the user plans on visiting. It does this by inserting the remaining characters into the URL form box.[301]

Firefox 14 has an optional GStreamer back-end for HTML5 video tag playback.[302] This allows playback of H.264 if the codec is installed as a GStreamer plugin. GStreamer support is not enabled in the official builds, but can be enabled at compile time.

The first beta version of Firefox 14 was not beta 1, but beta 6[303] and was released on June 5, 2012.

Version 15[edit]

Firefox 15 was released on August 28, 2012.[242]

This version includes a "Responsive Design View" developer tool,[304] adds support for the Opus audio format[305] and adds preliminary native PDF support (turned off by default).[306]

Silent updates automatically update Firefox to the latest version without notifying the user,[307] a feature that the web browsers Google Chrome and Internet Explorer 8 and above have already implemented,[308][309] although the user is able to disable that function.[310]

Mozilla improved regular startup time for Windows users.[311]

Version 16[edit]

Firefox 16 running on Windows 8.

Firefox 16 was released on October 9, 2012.

Plans for this version called for fixing of bugs still outstanding involving support of new features in Mac OS X Lion, improvements to startup speed when a user wants to restore a previous session,[312] and support for viewing PDF files inline without a plugin.

Opus audio format is now enabled by default. Support for web apps was added.[313]

The roll-out of Firefox 16.0.0 was stopped on October 10, 2012, after Mozilla detected a security flaw and recommended downgrading to 15.0.1 until the issue[314] could be fixed. The security flaw was fixed in version 16.0.1, which was released the following day, October 11, 2012.[315] Version 16.0.2 was released October 26, 2012. It fixed additional security issues, and is also the final release to support Mac OS X Leopard.[316]

Versions 17–23[edit]

Version 17 (ESR)[edit]

Firefox 17 and Firefox ESR 17 were released on November 20, 2012.[242] Firefox 17.0.1, with several bug fixes, launched on November 30, 2012.

Firefox 17 was not planned to bring as many user-facing features as previous releases, it brings improved display of location bar results,[345] improvements to the silent update mechanism for users with incompatible add-ons,[346] and refinements to the Click-To-Play system introduced in Firefox 14.[347] A new feature for developers, an HTML tree editor[348] is also included. Firefox 17 is the first version of the browser that uses SpiderMonkey 17.[349]

Starting with this version, Mac OS X support is exclusively for Snow Leopard, Lion, and Mountain Lion.

Version 18[edit]

Firefox 18 was released on January 8, 2013.[350] A new feature for Firefox 18 is IonMonkey, Mozilla's next generation JavaScript engine,[351] it also uses some functions of WebRTC.[352]

Firefox 18.0.1 was released on January 18, 2013, and fixed several bugs.[353] Firefox 18.0.2 was released on February 5, 2013.

Version 19[edit]

Firefox 19

Firefox 19 was released on February 19, 2013. Firefox 19 features a built-in PDF viewer.[354] Firefox 19.0.1 was released on February 27, 2013 to fix stability issues for some AMD Radeon HD graphics cards in Windows 8.[355] Firefox 19.0.2 was released on March 7, 2013 to address a security vulnerability in the HTML editor.[356]

Version 20[edit]

Firefox 20 was released on April 2, 2013. A new feature of Firefox 20 is a panel-based download manager,[357][358] along with H.264 decoding on the <video> tag (on Windows only), and per-window private browsing (per-tab private browsing on Android). It also includes a new developer toolbox, that combines all developer tools into one panel.

Firefox 20.0.1 was released on April 11, 2013, and included a Windows-only update to handle issues around handling UNC paths.[359]

Version 21[edit]

Firefox 21 was released on May 14, 2013. The Social API now supports multiple providers, enhanced three-state UI for Do Not Track (DNT).

Version 22[edit]

Firefox 22 was released on June 25, 2013. WebRTC is now enabled by default.[360] Partial CSS Flexbox support added (flex-wrap support is currently scheduled for Firefox 28[361]). A new feature for Firefox 22 was OdinMonkey, Mozilla's next generation JavaScript engine.

Version 23[edit]

Logo used from Firefox 23 to Firefox 56
Logo used from Firefox 23 to Firefox 56

Firefox 23 was released on August 6, 2013. It includes an updated Firefox logo, mixed content blocking enabled by default to defend against man-in-the-middle attacks, implementation of the <input type="range"> form control attribute in HTML5, dropping support for the <blink> HTML element as well as text-decoration:blink CSS element, the restriction to have to "switch to a different search provider across the entire browser", and a global browser console, a new network monitor among other things. JavaScript is automatically enabled by the update, without regard to the previous setting, and the ability to turn it off has been removed from the interface;[362] the "contentious" change was made because many websites depend on JavaScript and it was felt that users unaware that they had disabled JavaScript were attributing the resulting unpredictable layout to software bugs in Firefox.[363]

The keyword.URL preference now is no longer supported, making it no longer possible to specify the search engine for the URL bar that way. The search engine selected for the search bar on the Navigation Toolbar is now automatically used also for the URL bar and about:home page.[364][365]

Firefox 23.0.1 was released ten days later on August 16, 2013 to fix the rendering glitches on H.264 video only in FF23 on Windows Vista, it also fixed the spell checking that was broken with non-ASCII characters in profile path, and the audio static/"burble"/breakup in Firefox to Firefox WebRTC calls.[366]

Versions 24–30[edit]

Version 24 (ESR)[edit]

Firefox 24 and Firefox 24 ESR were released on September 17, 2013. The release includes support for the new scrollbar style in Mac OS X 10.7 (and newer), closing tabs to the right, an improved browser console for debugging, and improved SVG rendering, among other things.[391] Firefox 24 is the first version of the browser that uses SpiderMonkey 24.[392]

Version 25[edit]

Firefox 25 was released on October 29, 2013. Firefox 25 Nightly was at one point slated to include the Australis theme, but Australis did not actually land on Nightly until Firefox 28,[393] did not make it to Firefox 28 Aurora channel, and was finally available with Firefox 29.[394] This release added support for <iframe srcdoc> attribute, background-attachment:local in CSS, along with Web audio API support, separate find bar for each tab and many other bug fixes.[395][396][397]

Firefox 25.0.1 was released on November 15, 2013 to address issues with pages that sometimes wouldn't load without first moving the cursor.[398]

Version 26[edit]

Firefox 26 was released December 10, 2013. Firefox 26 changed the behavior of Java plugins to "click-to-play" mode instead of automatically running them. It also added support for H.264 on Linux, password manager support for script-generated fields, and the ability for Windows users without advanced write permissions to update Firefox, as well as many bug fixes and developer-related changes.[399]

Firefox 26.0.1 was released only for Android on December 20, 2013, just ten days after the desktop release. It fixed screen distortion on some devices after tapping on search suggestion.[400]

Version 27[edit]

Firefox 27 was released on February 4, 2014. It adds improved Social API and SPDY 3.1 support, as well as enabling of TLS 1.1 and 1.2 by default. Also, it brings many bug fixes, security improvements, and developer-related changes.[401]

Firefox 27.0.1 was released on February 13, 2014. It fixed stability issues with Greasemonkey and other JavaScript that used ClearTimeoutOrInterval, as well as JavaScript math correctness issues.[402]

Version 28[edit]

Firefox 28 was released on March 18, 2014. It added support for VP9 video decoding and support for Opus in WebM.[403] For Android, features such as predictive lookup from the address bar, quick share buttons and support for OpenSearch were added.[404]

Firefox 28.0.1 was released only for Android six days later. It fixed H.264 video playback issues on several Galaxy devices and includes a mobile-only security fix for file: URLs.[405]

Version 29[edit]

Firefox 29 with Australis interface, running on Windows 8.1

Firefox 29 was released on April 29, 2014 and includes the Australis interface, it also removes the add-on bar and moves its content to the navigation bar.[406]

Firefox 29.0.1 was released ten days later, fixing a few bugs.[407]

Version 30[edit]

Firefox 30 was released on June 10, 2014. It adds support for GStreamer 1.0 and a new sidebar button, and most plugins are not activated by default.[408][409]

Versions 31–37[edit]

Version 31 (ESR)[edit]

Firefox 31 and Firefox 31 ESR were released on July 22, 2014. Both versions added search field on the new tab page and were improved to block malware from downloaded files, along with other new features.[429] Firefox 31 ESR is the first ESR to include the Australis interface, unifying the user experience across different Firefox versions. Firefox 24.x.x ESR versions will be automatically updated to ESR version 31 after October 14, 2014.[430]

Version 32[edit]

Firefox 32 was released on September 2, 2014. It shows off HTTP caching improvements, adds HiDPI/Retina support in the Developer Tools UI and widens HTML5 support, among other things.[431][432] Firefox 32.0.1 was released for mobile only on September 10, 2014, fixing the link tap selection that is offset on some Android devices;[433] and for desktop two days later, fixing stability issues.[434] Firefox 32.0.2 was released for desktop only on September 18, 2014, fixing the corrupt installations causing Firefox to crash on update.[435] Firefox 32.0.3 was released for desktop and Android on September 24, 2014, fixing a security vulnerability.[436][437]

Version 33[edit]

Firefox 33 was released on October 14, 2014. It now has off-main-thread compositing (OMTC) enabled by default on Windows (which brings responsiveness improvements),[438] OpenH264 support, search suggestions on about:home and about:newtab, address bar search improvements, session restore reliability improvements, and other changes.[439]

Firefox 33.0.1 was released for desktop only on October 24, 2014, fixing displaying of a black screen at startup with certain graphics drivers.[440] Firefox 33.0.2 was released for desktop only on October 28, 2014, fixing a startup crash with some combination of hardware and drivers.[441] Firefox 33.0.3 was released for desktop only on November 6, 2014, fixing several issues related to graphics drivers.[442]

Firefox 33.1 was released on November 10, 2014, celebrating Firefox's 10-year anniversary.[443][444] Firefox 33.1.1 was released for desktop only on November 14, 2014, fixing a startup crash.[445]

Version 34[edit]

The logo of Firefox Hello.

Firefox 34.0 was released on December 1, 2014. It brings Firefox Hello (a WebRTC client for voice and video chat), an improved search bar, and the implementation of HTTP/2 (draft14) and ALPN, together with other features. It also disables SSLv3, and enables the ability to recover from a locked Firefox process and to switch themes and personas directly in the customization mode.[446]

Firefox 34.0.5 was released for desktop only on December 1, 2014, changing the default search engine to Yahoo! for North America.[447]

Version 35[edit]

Firefox 35.0 was released on January 13, 2015. It brings support for a room-based conversations model to the Firefox Hello chat service, and other functions, it includes security fixes.[448]

Firefox 35.0.1 was released first for desktop on January 26, 2015, fixing various issues,[449] and then for Android on February 5, 2015, fixing a 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.[450]

Version 36[edit]

Firefox 36.0 was released for desktop on February 24, 2015, bringing full HTTP/2 support and other smaller improvements and fixes.[451] It was also released for Android three days later on February 27, 2015, adding support for the tablet user interface.[452]

Firefox 36.0.1 was released for desktop on March 5, 2015, and the next day for Android, fixing various issues.[453][454]

Firefox 36.0.2 was released for Android only on March 16, 2015, fixing a startup crash on HTC One M8 devices (Verizon) with Android 5.0.1 and some potential crashes with Flash videos.[455]

Firefox 36.0.3 was released on March 20, 2015, soon after that, Version 36.0.4 was released on March 21, 2015, for desktop and Android, fixing security issues disclosed at HP Zero Day Initiative's Pwn2Own contest.[456][457][458][459]

Version 37[edit]

Firefox 37 was released on March 31, 2015, bringing a heartbeat user rating system, which provides user feedback about the Firefox, and improved protection against website impersonation via OneCRL centralized certificate revocation. Also, Bing search is changed to use HTTPS for secure searching, and added is support for opportunistic encryption of the HTTP traffic where the server supports HTTP/2's AltSvc feature.[460]

Firefox 37.0.1 was released on April 3, 2015 for desktop and Android, fixing security issues and several crash issues. It also disabled opportunistic encryption of the HTTP traffic introduced in 37.0.[461][462]

Firefox 37.0.2 was released for Android on April 14, 2015, fixing an issue related to the "request desktop site" feature,[463] and for desktop on April 20, 2015, fixing a Google Maps rendering issue, stability issues for some graphics hardware and feature sets, and certain security issues.[464]

Versions 38–44[edit]

Version 38 (ESR)[edit]

Both Firefox 38 and Firefox 38 ESR were released on May 12, 2015, with new tab-based preferences, Ruby annotation support and availability of WebSockets in web workers, along with the implementation of the BroadcastChannel API and other features and security fixes.[494]

Firefox 38.0.1 and ESR 38.0.1 were released on May 14, 2015 for desktop, fixing a number of stability issues.[495] Firefox 38.0.1 for Android was released on May 15, 2015, fixing a number of stability issues.[496]

Firefox 38.0.5 was released on June 2, 2015 for desktop and Android, fixing bugs and security issues, and adding new functionality that included integration of Pocket and availability of Reader View mode.[497][498] This was the first release offered to the Release channel users since 38.0.1.

Version 39[edit]

Firefox 39 was released on July 2, 2015 for desktop and Android, disabling insecure SSLv3 and RC4, improving performance for IPv6 fallback to IPv4 and including various security fixes.[499][500] Firefox 39.0.3 was released on August 6, 2015, to fix a zero-day exploit.[501]

Version 40[edit]

Firefox 40 was released on August 11, 2015 for desktop and Android. On Windows 10, the Australis theme was updated to reflect the overall appearance of Windows 10, and the interface is adapted for usability on touchscreens when used in the operating system's "Tablet mode". Firefox 40 includes additional security features, including the filtering of pages that offer potentially unwanted programs, and warnings during the installation of unsigned extensions; in future versions, signing of extensions will become mandatory, and the browser will refuse to install extensions that have not been signed. Firefox 40 also includes performance improvements, such as off-main-thread compositing on Linux.[502][503][504]

Firefox 40.0.2 was released for desktop only two days later on August 13, 2015, fixing some stability issues.[505]

Firefox 40.0.3 was released for desktop and Android on August 27, 2015, fixing some stability issues and security vulnerabilities.[506][507]

Version 41[edit]

Firefox 41 was released on September 22, 2015 for desktop and Android. Among many additions are the ability to set a profile picture for a Firefox account, enhanced IME support using Text Services Framework, and instant messaging on Firefox Hello.[508][509]

Firefox 41.0.1 was released for desktop only on September 30, 2015, fixing some stability issues.[510]

Firefox 41.0.2 was released on October 15, 2015, fixing a security vulnerability.[511]

Version 42[edit]

Firefox 42 was released on November 3, 2015 for desktop and Android. Among many additions are private browsing with tracking protection, IPv6 support in WebRTC, and the ability to view HTML source in a tab.[512][513]

Version 43[edit]

Firefox 43 was released on December 15, 2015 for desktop and Android. Among many additions are the availability of the 64-bit version for Windows 7 and above, a new strict blocklist, and audio indicators on Android.[514][515]

Firefox 43.0.1 was released on December 18, 2015 for desktop only, to prepare for the use of SHA-256 signing certificate for Windows builds, to meet a new signing requirement.[516] Three days later, Firefox 43.0.2 was released for desktop only, citing not only the use of SHA-256 signing certificate for Windows builds, but also various security fixes.[517] Firefox 43.0.3 was released for desktop only on December 28, 2015, fixing a network issue when using Nvidia's Network Access Manager, and improving the decoding of some videos on YouTube on some Windows configurations.[518] Firefox 43.0.4 was released for desktop only on January 6, 2016, fixing a startup crash for users of an antivirus tool, allowing the creation of multi-user Linux download folders, and re-enabling SHA-1 certificates.[519]

Version 44[edit]

Firefox 44 was released on January 26, 2016 for desktop and Android. Among many additions are the improvement of warning pages for certificate errors and untrusted connections, enabling of H.264 and WebM/VP9 video support on systems that don't support MP4/H.264, support for the brotli compression format via HTTPS content-encoding, and the use of Android print service to enable cloud printing.[520][521] "Ask me every time" cookies option was removed without any notifications.[522]

Firefox 44.0.1 was released on February 8, 2016 for desktop only, fixing an issue that could lead to the removal of stored passwords under certain circumstances; requiring NSS 3.21, and disabling opus/vorbis audio with H.264, among other things.[523] Firefox 44.0.2 was released three days later for desktop and Android, fixing issues where Firefox hangs or crashes on startup among other issues.[524][525]

Versions 45–51[edit]

Version 45 (ESR)[edit]

Firefox 45 and Firefox 45 ESR were released on March 8, 2016 for desktop (both) and Android (no ESR). Among many additions were Instant Browser sharing through Hello, the addition of Guarani locale, the ability to filter snapshot output in memory tool, and the removal of Tab Groups (panorama) feature.[555][556] Firefox 45.0.1 and Firefox 45.0.1 ESR were released on March 16, 2016 for desktop (both) and Android (no ESR). Several regressions are fixed and Graphite library is disabled.[557][558] Firefox 45.0.2 and Firefox 45.0.2 ESR were released on April 11, 2016 for desktop (both) and Android (no ESR). Many fixes included are for the cookie header, compatibility regression (both), and a regression with the copy and paste with some old versions of some Gecko applications like Thunderbird (desktop only).[559][560]

Version 46[edit]

Firefox 46 was released on April 26, 2016 for both desktop and Android. Among the many additions were improved security of the JavaScript Just In Time (JIT) Compiler, the GTK3 integration (Linux only), HKDF support for Web Crypto API, and removal of support for Android 3.0 (Android only).[561][562]

Firefox 46.0.1 was released on May 3, 2016 for both desktop and Android, fixing various issues, including add-on signing certificate expiration and page loading issue related to antivirus software.[563][564]

Version 47[edit]

Firefox 47 was released on June 7, 2016 for both desktop and Android. Among the many additions were 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; enabling VP9 video codec for users with fast machines; the ability of embedded YouTube videos to play with HTML5 video if Flash is not installed; and the addition of the Latgalian language. It is also the last Firefox version to support Android 2.3.x.[565][566]

Firefox 47.0.1 was released on June 28, 2016 for desktop only, which fixed an issue with the Selenium WebDriver.[567]

Version 48[edit]

Firefox 48 was released on August 2, 2016 for both desktop and Android. Among the many additions were enhanced download protection and the removal of Windows Remote Access Service modem Autodial. It was also the first official release with "Electrolysis" (multi-process Firefox, meaning that the interface and web pages are running in separate processes in the computer) was enabled for part of the users.

It is the last Firefox version to support Mac OS X Snow Leopard, Mac OS X Lion, and OS X Mountain Lion.[568] Additionally, support for old processors without SSE2 extensions such as the AMD Athlon XP and Pentium III was dropped.[568]

Update Firefox 48.0.1 was released on August 18, 2016 for desktop only, fixing a top crash in the JavaScript engine, another one caused by plugin issues, a shutdown issue, and other bugs.[569] Firefox 48.0.2 was released six days later for desktop only, which fixed a Windows-only startup crash issue caused by Websense.[570]

Version 49[edit]

Firefox 49 was released on September 20, 2016 for both desktop and Android. Among the many additions were an updated Firefox Login Manager, improved video performance for users on systems that support SSE3 without hardware acceleration, added context menu controls to HTML5 audio and video that let users loop files or play files at 1.25x speed, improvements in about:memory reports for tracking font memory usage, and the removal of Firefox Hello.[571][572] The macOS version now requires at least OS X Mavericks, and the Microsoft Windows version requires a CPU which supports SSE2.[568]

Firefox 49.0.1 was released three days later for desktop only, mitigating a Windows-only startup crash issue caused by Websense.[573]

Firefox 49.0.2 was released for both desktop and Android on October 20, 2016, among the changes are asynchronous rendering of the Flash plugins that is now enabled by default (desktop), and the fix for web compatibility issue with file uploads (Android).[574][575]

Version 50[edit]

Firefox 50 was released on November 15, 2016 for both desktop and Android. Among the many additions were 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; download protection for a large number of executable file types on Windows, macOS, and Linux, increased availability of WebGL to more than 98 percent of users on Windows 7 and newer (desktop), and support for HLS videos via player overlay (Android).[576][577]

Firefox 50.0.1 was released on November 28, 2016 for desktop only, fixing an issue where Firefox crashes with 3rd party Chinese IME when using IME text.[578] Firefox 50.0.2 was released two days later for both desktop and Android, fixing a zero-day exploit in the wild among other exploits.[579][580] Firefox 50.1.0 was released on December 13, 2016 for both desktop and Android, fixing more security bugs.[581][582]

Version 51[edit]

Firefox 51.0 was released on January 24, 2017 for both desktop and Android. Among the many additions were added support for FLAC (Free Lossless Audio Codec) playback, better Tab Switching, support for WebGL 2, and a warning that is displayed when a login page does not have a secure connection.[583][584] Firefox 51.0.1 was released two days later for desktop only, fixing issues where multiprocess incompatibility did not correctly register with some add-ons, and geolocation was not working on Windows.[585]

Firefox 51.0.2 was released on February 6, 2017 for Android only, fixing a crash caused by an Android library (Palette) on some x86 devices.[586] Firefox 51.0.3 was released three days later for Android only, this time fixing a build issue which was causing some crashes on some x86 architectures, and including various security fixes.[587]

Versions 52–59[edit]

Version 52 (ESR)[edit]

Firefox 52 and Firefox 52 ESR were released on March 7, 2017 for desktop (both) and Android (no ESR).

An important aspect of Firefox ESR 52.0 is that it is the first ESR version based on Firefox Electrolysis (Firefox 48) code base.

Among the many additions were: Added support for WebAssembly (while disabled in Firefox ESR 52), an emerging standard that brings near-native performance to Web-based games, apps, and software libraries without the use of plugins; automatic captive portal detection, for easier access to Wi-Fi hotspots; user warnings for non-secure HTTP pages with logins (desktop); and display of media controls to pause or resume playback on the Android notification bar.[616][617] This standard Firefox version is also the last version to support Windows XP and Vista.

Firefox dropped support for NPAPI plugins like Microsoft Silverlight and Java with the exception of Adobe Flash Player (except the ESR version which still supports NPAPI).[618]

Firefox 52.0.1 and 52.0.1 ESR were released on March 17, 2017 for desktop (both) and Android (no ESR), making various security fixes.[619][620] Firefox 52.0.2 and 52.0.2 ESR were released on March 28, 2017 for desktop (both) and Android (no ESR), this time fixing loading tab icons on session restore; fixing a crash on startup on Linux (desktop), and disabling presentation API to avoid page loading delays.[621][622]

Version 53[edit]

Firefox 53 was released on April 19, 2017 for both desktop and Android. Among the many additions are: improved graphics stability for Windows users with the addition of compositor process separation, light and dark "compact" themes available, based on the Firefox Developer Edition theme, removal of support for 32-bit macOS and 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 compositing, which allows playing videos with transparent backgrounds (desktop), Reader Mode displaying estimated reading time for the page (desktop and Android), and enabling two columns tabs setting in portrait mode (Android).[623][624]

Starting with this version, Microsoft Windows support is exclusively for Windows 7 and above.

Firefox 53.0.1 was released on April 27, 2017 for Android only, fixing some stability issues, including a rare condition that could prevent opening restored tabs.[625] Firefox 53.0.2 was released on May 5, 2017 for both desktop and Android, fixing some security and stability issues, including making form validation errors and date picker panel visible to the user (desktop) and a fix for issues with Android integration.[626][627] Firefox 53.0.3 was released on May 19, 2017 for desktop only, fixing some stability issues and bumping preloaded security information expiration times.[628]

Version 54[edit]

Firefox 54 was released on June 13, 2017 for both desktop and Android. Among the many additions are: simplifying the download button and download status panel, added support for multiple content processes, and the ability to create and save custom devices in Responsive web design mode (desktop), and improved audio and video playback in the browser, and improved bookmarks sync performance (Android).[629][630]

Firefox 54.0.1 was released on June 29, 2017 for both desktop and Android, fixing many issues including those of a tab title, opening a new tab, opening multiple tabs, a PDF printing issue (desktop) and crashes in tab tray menu and issues with navigation (Android).[631][632]

Version 55[edit]

Firefox 55 was released on August 8, 2017 for both desktop and Android. Among the many additions are: the launch of Windows support for WebVR, bringing immersive experiences to the web, options that let users optimize recent performance improvements, simplification of installation process with a streamlined Windows stub installer, improvement of address bar functionality, simplification of printing from Reader Mode (desktop), and the option to accessibility settings to respect the system's set font size when displaying web pages (Android). This is also the last version to support Android Ice Cream Sandwich.[633][634]

Firefox 55.0.1 was released on August 10, 2017 for desktop only, just two days after its initial launch, fixing some issues including a regression of the tab restoration process.[635] Firefox 55.0.2 was released on August 16, 2017 for both desktop and Android, fixing some issues including a regression with the pop-up menu, an issue with new installation notification for sideload add-ons (desktop), and a crash with Telemetry (Android).[636][637] Firefox 55.0.3 was released on August 25, 2017 for desktop only, fixing file uploads to some websites, including YouTube, and an issue with addons when using a path containing non-ASCII characters.[638]

Version 56[edit]

Firefox 56 was released on September 28, 2017 for both desktop and Android. Among the many additions are: a new layout for the "Preferences" page, the launch of Firefox Screenshots, support for address form autofill, hardware acceleration for AES-GCM, update of the Safe Browsing protocol to version 4, and improved security or verifying update downloads (desktop), and improvement of support for WebExtensions, and the end of support for Adobe Flash (Android). Starting with this version, Android support is exclusively for Android Jelly Bean and above.[639][640]

Firefox 56.0.1 was released on October 9, 2017 for desktop only, blocking D3D11 when using Intel drivers on Windows 7 systems with partial AVX support, and migrating users of 32-bit Firefox on 64-bit Windows to 64-bit Firefox for increased stability and security.[641]

Firefox 56.0.2 was released on October 26, 2017 for desktop only, disabling Form Autofill completely on user request, fixing video-related crashes on Windows 7 and a shutdown crash, and correcting detection for 64-bit GSSAPI authentication.[642]

Version 57[edit]

Logo used from Firefox 57
Logo used from Firefox 57

Firefox 57 was released on November 14, 2017 for desktop and Android with the name Firefox Quantum.[643] ZDNet dubbed it a "comeback" following years of falling market share against Google Chrome.[644][645] The release included a new interface design, codenamed "Photon", and a new rendering engine almost twice as fast as the previous one used.[643][644][646] One of the largest visual changes in Photon was the removal of the search box from the address bar. Firefox 57 no longer supports legacy add-ons using XUL technologies.[647][648][649] That same day, Mozilla announced that Google would be the default search engine in the USA and Canada, a departure from Yahoo, which had been the default search engine in the USA and Canada since 2014.[650]

Firefox 57.0.1 was released on November 29, 2017 for desktop and Android. Features include a fix for a video color distortion issue on YouTube and other video sites with some AMD devices, a fix for a Google Maps crash on macOS with Intel HD Graphics 3000, the block of an injection of a client library associated with the RealPlayer Free Player which is known to cause performance problems (desktop), and a fix for a stop button issue (Android).[651][652]

Firefox 57.0.2 was released on December 7, 2017 for desktop only, blocking old versions of G Data Endpoint Security for crashing Firefox on start up and fixing a regression with WebGL and D3D9 (both Windows only).[653]

Firefox 57.0.3 was released on December 28, 2017 for desktop only, fixing a crash reporting issue that inadvertently sends background tab crash reports to Mozilla without a user opt-in.[654]

Firefox 57.0.4 was released on January 4, 2018 for desktop and Android, with security fixes to address the Meltdown and Spectre timing attacks.[655][656]

Version 58[edit]

Firefox 58 was released on January 23, 2018 for desktop and Android. Among the additions were: support for credit card autofill, the drop of support for user profiles in previous versions of Firefox, a warning to alert users and site owners of planned security changes to sites affected by the gradual distrust plan for the Symantec certificate authority (desktop), full screen bookmark management with folder support, support for FLAC (Free Lossless Audio Codec) playback, ability to change the status bar color in themes, and removal of the Firefox Search widget from home screen (Android).[657][658]

Firefox 58.0.1 was released on January 29, 2018 for desktop and Android. Among the fixes were a fix for an issue in which Firefox 58.0 would fail to load pages when using certain non-default security policies on Windows (desktop), and a fix for a performance issue whereby some installations were initially slow to load pages (Android).[659][660]

Firefox 58.0.2 was released on February 7, 2018 for desktop and Android. Some fixes included one for a tab crash during printing, and one for clicking links and scrolling emails on Microsoft Hotmail and Outlook (OWA) webmail (desktop), and one for an issue in which, if the user cancels a download by exiting the app chooser dialogue without choosing anything, the download continues invisibly in the background (Android).[661][662]

Version 59[edit]

Firefox 59 was released on March 13, 2018 for desktop and Android. Among the additions were: faster load times and improved graphics, improved Real-Time Communications (RTC) capabilities, additional features for Firefox Screenshots, support for W3C specs for pointer events, and Private Browsing Mode's removal of path information from referrers to prevent cross-site tracking (desktop), and the addition of Firefox as an Assist app, support for HLS (HTTP Live Streaming) playback for improved compatibility with video sites, and removal of the "about:" page.[663][664] Firefox 59.0.1 was released for desktop and Android on March 16, 2018, just three days after its official release, with various security fixes.[665][666]

Firefox 59.0.2 was released for desktop and Android on March 26, 2018. Among the fixes were those for invalid page rendering with hardware acceleration enabled and for high CPU / memory churn caused by third-party software on some computers (desktop), a fix for a top crasher on Firefox for Android, and a fix for URL fragment identifiers that break Service Worker responses (both).[667][668] Firefox 59.0.3 was released for desktop only on April 30, 2018, fixing a compatibility issue with the Windows 10 April 2018 update.[669]

Versions 60–66[edit]

Version 60 (ESR)[edit]

Firefox 60 and Firefox 60 ESR were released on May 9, 2018 for desktop (both) and Android (no ESR).

Among the many additions were: a policy engine that allows customized Firefox deployments in enterprise environments, using Windows Group Policy or a cross-platform JSON file, enhancements to New Tab / Firefox Home, redesigned Cookies and Site Storage section in Preferences for greater clarity and control of first- and third-party cookies, the application of Quantum CSS to render browser UI, support for Web Authentication API, which allows USB tokens for website authentication, an option for Linux users to show or hide page titles in a bar at the top of the browser, improved WebRTC audio performance and playback for Linux users (desktop), exclusive support for extensions built using the WebExtension API (ESR), the implementation of Quantum CSS (also known as Stylo) in Android for faster page rendering; and the addition of View Page Source option to the Page Action menu (Android).[734][735][736]

Firefox 60.0.1 and Firefox 60.0.1 ESR were released on May 16, 2018 for desktop (both) and Android (no ESR), a week after the browser's official release. Among the many fixes were: fix for the momentum scrolling on non-zoomable pages on touchscreen devices, fix for black map on Google Maps with updated Nvidia Web Drivers on macOS, use for the right default background when opening tabs or windows in high contrast mode, and restoration of translations of the Preferences panels when using a language pack (desktop and ESR).[737][738][739]

Firefox 60.0.2 and Firefox 60.0.2 ESR were released on June 6, 2018 for desktop (both) and Android (no ESR). Among the fixes were those for the missing nodes in the developer tools Inspector panel and the font rendering when using third-party font managers on OS X 10.11 and earlier (desktop and ESR); and the update to NSS 3.36.4 from 3.36.1.[740][741][742]

Version 61[edit]

Firefox 61 was released on June 26, 2018 for both desktop and Android. Among the many additions were: Improvements for dark theme support across the entire Firefox user interface, added support to allow WebExtensions to hide tabs, improved bookmark syncing, convenient access to more search engines (desktop), improved security and enhanced performances (both), and the fix for a recurring crash on Samsung Galaxy S8 devices running Android Oreo (Android).[743][744]

Firefox 61.0.1 was released on July 5, 2018 for desktop only. Among the fixes were those for broken website loading for Chinese users with accessibility enabled, missing content on the New Tab Page and the Home section of the Preferences page, loss of bookmarks under rare circumstances when upgrading from Firefox 60, launching of downloads without a file extension on Windows, and improved playback of Twitch 1080p video streams.[745]

Firefox 61.0.2 was released on August 8, 2018 for both desktop and Android. It features added support for automatically restoring a Firefox session after Windows restarts and improved website rendering with the Retained Display List feature enabled, as well as fixes for broken DevTools panels with certain extensions installed, a crash for users with some accessibility tools enabled (desktop), and a crash on devices running Android KitKat 4.4 or earlier.[746][747]

Version 62[edit]

Firefox 62 was released on September 5, 2018 for both desktop and Android. Among the many additions were: FreeBSD support for WebAuthn, a preference that allows users to distrust certificates issued by Symantec in advance of removing all trust for Symantec-issued certificates in Firefox 63, improved graphics rendering for Windows users without accelerated hardware using Parallel-Off-Main-Thread Painting, CSS Variable Fonts (OpenType Font Variations) support, and support for CSS Shapes, allowing for richer web page layouts (desktop), and improved scrolling performance, faster page load times over WiFi connections by loading from the network cache if disk cache is slow, and “Product and feature tips” toggle in Notifications settings (Android).[748][749]

Firefox 62.0.1 was released two days later, September 7, 2018, for Android only, fixing a crash when navigating sites with WebGL content.[750] Firefox 62.0.2 was released on September 21, 2018 for both desktop and Android. Among the many fixes were: fixed for WebGL rendering issues, fallback on startup when a language pack is missing, an issue in which updates from unpacked language packs break the browser, rendering of some web sites, compatibility with some sites using deprecated TLS settings, and screen share on macOS when using multiple monitors, and oversized quick share icons on Android 6.0 and newer.[751][752] Firefox 62.0.3 was released on October 2, 2018 for both desktop and Android, fixing hangs on macOS Mojave (10.14) when various dialog windows (upload, download, print, etc) are activated, and a playback of some encrypted video streams on macOS (desktop).[753][754]

Version 63[edit]

Firefox 63 was released on October 23, 2018 for both desktop and Android. Among the many additions and changes were: Performance and visual improvements for Windows and macOS users, content blocking, WebExtensions running in their own process in Linux, recognition of the operating system accessibility setting for reducing animation, the addition of Amazon and Google as Top Sites tiles on the Firefox Home (New Tab) page, the removal of the "Never Check for Updates" option from "about:preferences" and "Open in Sidebars" feature from the Library (desktop), support for Picture-In-Picture video, and use of notification channels (Android).[755][756]

Firefox 63.0.1 was released on Halloween 2018 for desktop only, fixing issues where snippets are not loaded due to missing element, print preview always shows 30% scale when it is actually Shrink To Fit, and dialog displayed when closing multiple windows shows unreplaced %1$S placeholder in Japanese and potentially other locales.[757]

Firefox 63.0.2 was released on November 7, 2018 for Android only, fixing issues in which session history popup breaks after one usage, along with the flickering of (some) sticky elements on Twitter and other websites, a hang in Samsung Galaxy devices, and crash fixes.[758] Firefox 63.0.3 was released on November 15, 2018, over a week later for desktop only, this time fixing some issues such as slow page loading for some users with specific proxy configurations, and games using WebGL (created in Unity) getting stuck after very short time of gameplay.[759]

Version 64[edit]

Firefox 64 was released on December 11, 2018 for desktop only. Among the many additions and changes were: better recommendations, enhanced tab management, easier performance management, improved performance for Mac and Linux users, by enabling link time optimization (Clang LTO), more seamless sharing on Windows, the option to remove add-ons using the context menu on their toolbar buttons, TLS certificates issued by Symantec that are no longer trusted by Firefox, and the availability of WebVR on macOS.[760] Three days later, Firefox 64.0.1 was released for Android only. Among the many additions and changes were: faster and more responsive scrolling and fixes for performance lags for users with installed password manager apps and an issue that resulted in the loading indicator using too much CPU and power.[761]

Firefox 64.0.2 was released on January 9, 2019 for both desktop and Android. Among the many fixes were those for a browser crash on macOS, video stuttering on YouTube, an update for the Japanese translation for missing strings (desktop), and fixes for crashes when Firefox for Android is put in background and when using Web Speech.[762][763]

Version 65[edit]

Firefox 65 was released on January 29, 2019, for both desktop and Android. Among the many additions and changes were: improved performance and web compatibility, with support for the WebP image format; enhanced security for macOS, Linux, and Android users via stronger stack smashing protection which is now enabled by default for all platforms (both desktop and Android); enhanced tracking protection; updated language settings in Preferences; support for Handoff on macOS; better video streaming experience for Windows users; easier performance management; improved pop-up blocker; the availability of Firefox for Windows with 32- and 64-bit MSI installers for easier enterprise deployments; additional support for Flexbox (desktop); and the restoration of Chromecast controls to the location bar (Android).[764][765]

Firefox 65.0.1 was released on February 12, 2019, for both desktop and Android. Among the many fixes were: a fix for accidental requests to addons.mozilla.org when an addon recommendation doorhanger is shown, improved playback of interactive Netflix videos, a fix for color management not working on macOS, a fix for incorrect sizing of the "Clear Recent History" window in some situations, fixes for video and audio issues during WebRTC calls (desktop), and a fix for looping CONNECT requests when using WebSockets over HTTP/2 from behind a proxy server (both).[766][767] Firefox 65.0.2 was released on February 28, 2019 for desktop only, fixing an issue with geolocation services affecting Windows users.[768]

Version 66[edit]

Firefox 66 was released on March 19, 2019, for both desktop and Android. Among the many additions and changes were: Prevention of websites from automatically playing sound, smoother scrolling (both), improved search experience and performance and better user experience for extensions, the addition of basic support for macOS Touch Bar and of support for Windows Hello on Windows 10, the enabling of AV1 support on 32-bit Windows and MacOS (desktop), and the addition of support to open files from external storage, such as an SD card (Android).[769][770]

Firefox 66.0.1 was released three days later for both desktop and Android with various security fixes.[771][772] Firefox 66.0.2 was released on March 27, 2019 for both desktop and Android, this time fixing Web compatibility issues with Office 365, iCloud and IBM WebMail caused by recent changes to the handling of keyboard events, along with crash fixes (desktop) and fixes for frequent crashes on sites using the OpenH264 video codec for WebRTC.[773][774] Firefox 66.0.3 was released on April 10, 2019 for desktop only, fixing an issue for an address bar on tablets running Windows 10, performance issues with some HTML5 games, a bug with keypress events in IBM cloud applications, and keypress events in some Microsoft cloud applications.[775]

Release history of Firefox versions 60 through 66
Legend:   Former release   Extended Support Release (ESR)   Current   Beta   Future official release   Future test release Top
Version Release date[18] Release type and highlights[t 1]
60.0 May 9, 2018 Official Firefox 60.0 release.[776][777]
  • Added a policy engine that allows customized Firefox deployments in enterprise environments, using Windows Group Policy or a cross-platform JSON file
  • DNS over HTTPS (DOH) functionality available.
  • Enhancements to New Tab / Firefox Home
    • Responsive layout that shows more content for users with wide-screen displays
    • Highlights section includes web sites saved to Pocket
    • More options to reorder sections and content on the page
    • Pocket Sponsored Stories will appear for a percentage of users in the US.
  • Redesigned Cookies and Site Storage section in Preferences for greater clarity and control of first- and third-party cookies
  • Applied Quantum CSS to render browser UI
  • Added support for Web Authentication API, which allows USB tokens for website authentication
  • Enhanced camera privacy indicators: Firefox now turns off your camera and the camera's light when you disable video recording, and turns the camera and light on when you resume recording
  • Added an option for Linux users to show or hide page titles in a bar at the top of the browser.
  • Improved WebRTC audio performance and playback for Linux users
  • Locale added: Occitan (oc)
  • Various security fixes
  • Changed the Windows shortcut for entering Reader View to F9, for better compatibility with keyboard layouts that use AltGr
  • Bookmarks no longer support multiple keywords for the same URL unless the request has different POST data
  • TLS certificates issued by Symantec before June 1st, 2016 are no longer trusted by Firefox
  • Updated the Skia graphics library to milestone 66
  • Changes affecting developers
Android
  • Implemented Quantum CSS (also known as Stylo) in Android for faster page rendering
  • Added View Page Source option to the Page Action menu
  • Various security fixes
  • Changes affecting developers
60.0.1 May 16, 2018 Off-cycle stability update.[778][779]
  • Avoided overly long cycle collector pauses with some add-ons installed
  • Fixed an issue in which, after unchecking the "Sponsored Stories" option, the New Tab page now immediately stops displaying "Sponsored content" cards
  • On touchscreen devices, fixed momentum scrolling on non-zoomable pages
  • Fixed black map on Google Maps with updated Nvidia Web Drivers on macOS
  • Corrected use of the right default background when opening tabs or windows in high contrast mode
  • The Firefox uninstaller on Windows is now translated again
  • Restored translations of the Preferences panels when using a language pack
  • WebVR has been disabled by default on macOS
Android
  • On touchscreen devices, fixed momentum scrolling on non-zoomable pages
60.0.2 June 6, 2018 Off-cycle security and stability update.[780][781]
Desktop
  • Fix for missing nodes in the developer tools Inspector panel
  • Fix for font rendering when using third-party font managers on OS X 10.11 and earlier
  • Various security fixes
Both
  • Updated to NSS 3.36.4 from 3.36.1:
    • Fixed an issue in which connecting to a server that was recently upgraded to TLS 1.3 would result in a SSL_RX_MALFORMED_SERVER_HELLO error
    • Fix for a crash on macOS related to authentication tokens, e.g. PK11 or WebAuthn

End-of-life 60.0.x product line[not in citation given (See discussion.)] on June 26, 2018.

60.0esr May 9, 2018 Official Firefox 60.0 Extended Support Release (ESR).[782]
  • Firefox Quantum arrives in the ESR channel. Key features include:
    • A completely new browser engine, designed to take full advantage of the processing power in modern devices
    • A redesigned interface with a clean, modern appearance, consistent visual elements, and optimizations for touch screens
    • A unified address and search bar. New installs will see this unified bar.
    • A revamped new tab page that includes top visited sites, recently visited pages, and recommendations from Pocket (in the US, Canada, and Germany)
    • An updated product tour to orient new and returning Firefox users
  • Support for enterprise environments, with a policy engine that allows customized Firefox deployments using Windows Group Policy or a cross-platform JSON file
  • Firefox now exclusively supports extensions built using the WebExtension API. Unsupported legacy extensions will no longer work in Firefox 60 ESR, but they will continue to work in Firefox 52 ESR, which will be supported until September 2018.
  • DNS over HTTPS (DOH) functionality available.
  • TLS certificates issued by Symantec before June 1st, 2016 are no longer trusted by Firefox. The "security.pki.distrust_ca_policy" preference can be set to 0 to reinstate trust in those certificates
60.0.1esr May 16, 2018 Off-cycle stability update[783]
  • Avoided overly long cycle collector pauses with some add-ons installed
  • Fixed an issue in which, after unchecking the "Sponsored Stories" option, the New Tab page now immediately stops displaying "Sponsored content" cards
  • On touchscreen devices, fixed momentum scrolling on non-zoomable pages
  • Fixed black map on Google Maps with updated Nvidia Web Drivers on macOS
  • Corrected use of the right default background when opening tabs or windows in high contrast mode
  • The Firefox uninstaller on Windows is now translated again
  • Restored translations of the Preferences panels when using a language pack
  • WebVR has been disabled by default on macOS
60.0.2esr June 6, 2018 Off-cycle security and stability update.[784]
  • Fix for missing nodes in the developer tools Inspector panel
  • Various security fixes
  • Updated to NSS 3.36.4 from 3.36.1:
    • Fixed an issue in which connecting to a server that was recently upgraded to TLS 1.3 would result in a SSL_RX_MALFORMED_SERVER_HELLO error
    • Fix for a crash on macOS related to authentication tokens, e.g. PK11 or WebAuthn
60.1.0esr June 26, 2018 Regular security and stability update.[785]
  • Various security fixes
  • Various stability and regression fixes
60.2.0esr September 5, 2018 Regular security and stability update.[786]
  • Various security fixes
  • Various stability and regression fixes
60.2.1esr September 21, 2018 Off-cycle security and stability update.[787]
  • Disabled multiprocess support for users running old versions of the JAWS screen reader software
  • Fixed a startup crash affecting users migrating from older ESR releases
  • Cleaned up old NSS DB files after upgrading
  • Various security fixes
60.2.2esr October 2, 2018 Off-cycle security and stability update.[788]
  • Fixed hangs on macOS Mojave (10.14) when various dialog windows (upload, download, print, etc) are activated
  • Various security fixes
60.3esr October 23, 2018 Regular security and stability update.[789]
  • Various stability and regression fixes
  • Various security fixes
60.4esr December 11, 2018 Regular security and stability update.[790]
  • Updated list of currency codes to include Unidad Previsional (UYW)
  • Various security fixes
60.5esr January 28, 2019 Regular security update.[791]
  • Various security fixes
60.5.1esr February 12, 2019 Off-cycle security update.[792]
  • Various security fixes
60.5.2esr February 22, 2019 Off-cycle stability update.[793]
  • Fixed a frequent crash when reading various Reuters news articles
60.6esr March 19, 2019 Regular security update.[794]
  • Various security fixes
  • In the network connections settings, sites added to the "No proxy for" list will now honor that setting regardless of any other specified proxy settings
60.6.1esr March 22, 2019 Off-cycle security update.[795]
  • Various security fixes

End-of-life 60.x.x product line[not in citation given (See discussion.)] on October 22, 2019.

60.7esr May 14, 2019 [796]
60.8esr July 9, 2019 [796]
60.9esr September 3, 2019 [796]
61.0 June 25, 2018 Official Firefox 61.0 release.[797][798]
  • Enhanced performance:
    • Faster page rendering with Quantum CSS improvements and the new retained display list feature
    • Faster switching between tabs on Windows and Linux
    • WebExtensions now run in their own process on MacOS
  • Convenient access to more search engines: You can now add search engines to the address bar “Search with” tool from the page action menu when on a webpage that provides an OpenSearch plugin
  • Share links from Firefox for MacOS more easily: You can now share the URL of an active tab from the page actions menu in the address bar
  • Improved security:
    • On-by-default support for the latest draft of the TLS 1.3 specification
    • Access to FTP subresources inside http(s) pages has been blocked
  • A more consistent user experience: Improvements for dark theme support across the entire Firefox user interface
  • More customization for tab management: added support to allow WebExtensions to hide tabs
  • Improved bookmark syncing
  • The settings for customizing your homepage and new tab page in Firefox have been added to a new Preferences section that can be accessed from Firefox at about:preferences#home. The settings can also be accessed via the gear icon on the New Tab page.
Android
  • Performance enhancements:
    • Quantum CSS improvements which improve page rendering times
    • Faster scrolling due to treating touch event listeners as passive by default
  • Improved security: On-by-default support for the latest draft of the TLS 1.3 specification
  • Fixed a recurring crash on Samsung Galaxy S8 devices running Android Oreo (8.0)
61.0.1 July 5, 2018 Off-cycle stability update.[799]
Desktop
  • Fixed broken website loading for Chinese users with accessibility enabled
  • Fix for missing content on the New Tab Page and the Home section of the Preferences page
  • Fixed loss of bookmarks under rare circumstances when upgrading from Firefox 60
  • Improved playback of Twitch 1080p video streams
  • Web pages no longer lose focus when a browser popup window is opened
  • Fixed launching of downloads without a file extension on Windows
  • Re-allowed downloading files from FTP sites via the "Save Link As" option when linked from HTTP pages
  • Fixed extensions being unable to override the default homepage in certain situations
61.0.2 August 8, 2018 Off-cycle stability update.[800][801]
  • Adds support for automatically restoring your Firefox session after Windows restarts
  • Improved website rendering with the Retained Display List feature enabled
  • Fixed broken DevTools panels with certain extensions installed
  • Fixed a crash for users with some accessibility tools enabled
Android
  • Fixed a crash on devices running Android KitKat 4.4 or earlier

End-of-life 61.0.x product line[not in citation given (See discussion.)] on September 5, 2018.

62.0 September 5, 2018 Official Firefox 62.0 release.[802][803]
  • Firefox Home (the default New Tab) now allows users to display up to 4 rows of top sites, Pocket stories, and highlights
  • “Reopen in Container” tab menu option appears for users with Containers that lets them choose to reopen a tab in a different container
  • In advance of removing all trust for Symantec-issued certificates in Firefox 63, a preference was added that allows users to distrust certificates issued by Symantec
  • Added FreeBSD support for WebAuthn
  • Improved graphics rendering for Windows users without accelerated hardware using Parallel-Off-Main-Thread Painting
  • Support for CSS Shapes, allowing for richer web page layouts. This goes hand in hand with a brand new Shape Path Editor in the CSS inspector
  • CSS Variable Fonts (OpenType Font Variations) support, which makes it possible to create beautiful typography with a single font file
  • Updates for enterprise environments:
    • AutoConfig is sandboxed to the documented API by default
  • Added Canadian English (en-CA) locale
  • Removed the description field for bookmarks
  • Dark theme is automatically enabled in macOS 10.14 dark mode
  • Changed the default setting to Enforce (3) for the security.pki.name_matching_mode preference
  • Adobe Flash applets now run in a more secure mode using process sandboxing on macOS
  • Users disconnecting from Sync are now offered the option to wipe their Firefox profile data (including bookmarks, passwords, history, cookies, and site data) from their desktop computer
  • Changed how WebRTC handles screen sharing: When screen-sharing a window, the window will be brought to front
  • Three-pane Inspector in Developer Tools separates the rules into its own panel
  • Changes affecting developers
Android
  • Improved scrolling performance
  • Faster page load times over WiFi connections by loading from the network cache if disk cache is slow
  • “Product and feature tips” toggle in Notifications settings, allowing for more control over which notifications are shown
  • WebRTC video sessions between Firefox for Android and Safari browsers works again
62.0.1 September 7, 2018 Off-cycle stability update.[804]
Android
  • Fixed a crash when navigating sites with WebGL content
62.0.2 September 21, 2018 Off-cycle security and stability update.[805][806]
  • Unvisited bookmarks can once again be autofilled in the address bar
  • Fixed WebGL rendering issues
  • Updates from unpacked language packs no longer break the browser
  • Fix for fallback on startup when a language pack is missing
  • Fixed an issue in which profile refresh from the Windows stub installer restarts the browser
  • Properly restored window size and position when restarting on Windows
  • Avoided crash when sharing a profile with newer (as yet unreleased) versions of Firefox
  • Fixed an issue in which you do not undo removal of search engines when using a language pack
  • Fixed rendering of some web sites
  • Restored compatibility with some sites using deprecated TLS settings
  • Fix for screen share on MacOS when using multiple monitors
  • Various security fixes
Android
  • Fixed rendering of some web sites
  • Restored compatibility with some sites using deprecated TLS settings
  • Oversized quick share icons on Android 6.0 and newer
  • Various security fixes
62.0.3 October 2, 2018 Off-cycle security and stability update.[807][808]
  • Fixed hangs on macOS Mojave (10.14) when various dialog windows (upload, download, print, etc) are activated
  • Fixed playback of some encrypted video streams on macOS
  • Various security fixes
Android
  • Various security fixes

End-of-life 62.0.x product line[not in citation given (See discussion.)] on October 23, 2018.

63.0 October 23, 2018 Official Firefox 63.0 release.[809][810]
  • Performance and visual improvements for Windows users
    • Moved the build infrastructure of Firefox on Windows to the Clang toolchain, bringing important performance gains
    • Firefox theme now matches the Windows 10 OS Dark and Light modes
  • Performance improvements for macOS users
    • Improved reactivity
    • Faster tab switching
    • WebGL power preferences allow non-performance-critical applications and applets to request the low-power GPU instead of the high-power GPU in multi-GPU systems
  • Added content blocking, a collection of Firefox settings that offer users greater control over technology that can track them around the web.
  • WebExtensions now run in their own process on Linux
  • Firefox now warns about having multiple windows and tabs open when quitting from the main menu
  • Firefox now recognizes the operating system accessibility setting for reducing animation
  • Added search shortcuts for Top Sites: Amazon and Google appear as Top Sites tiles on the Firefox Home (New Tab) page (U.S. only)
  • Resolved an issue that prevented the address bar from autofilling bookmarked URLs in certain cases
  • In the Library, the Open in Sidebar feature for individual bookmarks was removed
  • The option to Never check for updates was removed from about:preferences
  • The Ctrl+Tab shortcut now displays thumbnail previews of your tabs and cycles through tabs in recently used order
  • Refreshed visual style of Developer Tools menus to improve navigation and consistency
  • The Dev Tools accessibility inspector is now enabled by default
  • Added support for Web Components custom elements and shadow DOM
  • The inspector now ships with a Font Editor that allows you to control non-variable as well as variable fonts
Android
  • Added support for Picture-In-Picture video
  • Started using notification channels
  • Locales added: English from Canada (en-CA), and Ligurian (lij)
  • App now targets Oreo with security and performance improvements and support for new features
63.0.1 October 31, 2018 Off-cycle stability update.[811]
Desktop
  • Fixed an issue in which snippets are not loaded due to a missing element
  • Fixed an issue in which print preview always shows 30% scale when it is actually Shrink To Fit
  • Fixed an issue in which dialog displayed when closing multiple windows shows unreplaced %1$S placeholder in Japanese and potentially other locales
63.0.2 November 7, 2018 Off-cycle stability update.[812]
Android
  • Fixed an issue in which session history popup breaks after one usage
  • Fixed flickering of (some) sticky elements on Twitter and other websites
  • Fixed a hang in Samsung Galaxy devices
  • Crash fixes
63.0.3 November 15, 2018 Off-cycle stability update.[813]
Desktop
  • Fixed an issue in which games using WebGL (created in Unity) get stuck after very short time of gameplay
  • Fixed slow page loading for some users with specific proxy configurations
  • Disabled HTTP response throttling by default for causing bugs with videos in background tabs
  • Fixed an issue in which opening magnet links no longer works
  • Crash fixes

End-of-life 63.0.x product line[not in citation given (See discussion.)] on December 11, 2018.

64.0 December 11, 2018 Official Firefox 64.0 release for desktop.[814]
Desktop
  • Better recommendations: You may see suggestions in regular browsing mode for new and relevant Firefox features, services, and extensions based on how you use the web (for US users only)
  • Enhanced tab management: You can now select multiple tabs from the tab bar and close, move, bookmark, or pin them quickly and easily
  • Easier performance management: The new Task Manager page found at about:performance lets you see how much energy each open tab consumes and provides access to close tabs to conserve power
  • Improved performance for Mac and Linux users, by enabling link time optimization (Clang LTO).
  • More seamless sharing on Windows: Windows users can now share web pages using the native sharing experience
  • Added option to remove add-ons using the context menu on their toolbar buttons
  • Updated the policy engine on macOS to allow using configuration profiles to customize Firefox for enterprise deployments
  • Various security fixes
  • RSS feed preview and live bookmarks are available only via add-ons
  • TLS certificates issued by Symantec are no longer trusted by Firefox
  • about:crashes has been redesigned to make it clear when a crash is being submitted to Mozilla, as well as being clear that removing crashes locally does not remove them from crash-stats.mozilla.com
  • The macOS keyboard shortcut to add "www" and ".com" to a URL is now ctrl-enter instead of [apple]-enter
  • You may now overlay multiple CSS grids at the same time (up to 3) in the CSS Grid Inspector
  • The Web Console's command line now highlights JavaScript syntax
  • When hovering over elements in the Accessibility panel, the contrast ratio of text against background is now indicated
  • Added support for the new CSS scrollbar specification
  • WebVR is now available on macOS
64.0.1 December 14, 2018 Official Firefox 64.0 release for Android.[815]
Android
  • Scrolling is faster and more responsive
  • Files downloaded after this update are no longer deleted when uninstalling Firefox
  • Fixed performance lags for users with installed password manager apps
  • Fixed an issue that resulted in the loading indicator using too much CPU and power
  • Various security fixes
  • TLS certificates issued by Symantec are no longer trusted by Firefox
64.0.2 January 9, 2019 Off-cycle stability update.[816][817]
  • Fixed a browser crash on MacOS
  • Updated the Japanese translation for missing strings
  • Properly restored column sizes in developer tools inspector
  • Fixed video stuttering on Youtube
  • Fix for updates for some lightweight themes
Android
  • Fixed a crash when Firefox for Android is put in background
  • Fixed a crash when using Web Speech

End-of-life 64.0.x product line[not in citation given (See discussion.)] on January 29, 2019.

65.0 January 28, 2019 Official Firefox 65.0 release.[818][819]
  • Enhanced tracking protection: Simplified content blocking settings give users standard, strict, and custom options to control online trackers.
  • Updated Language section in Preferences
  • Support for Handoff on macOS
  • A better video streaming experience for Windows users: Firefox now supports the next-generation, royalty-free video compression technology called AV1.
  • Improved performance and web compatibility, with support for the WebP image format
  • Various security fixes.
  • Enhanced security for macOS, Linux, and Android users via stronger stack smashing protection which is now enabled by default for all platforms.
  • Firefox will now warn you when closing a window (regardless of whether you have automatic session restore enabled for restart).
  • Revamped Task Manager page found at about:performance
  • Improved the pop-up blocker to prevent multiple pop-up windows from being opened by websites at the same time.
  • Firefox for Windows is now available with 32- and 64-bit MSI installers for easier enterprise deployments.
  • Launched a new Flexbox inspector tool that details Flexbox containers and helps debug Flex item sizes
  • All CSS changes made in the Rules panel are now tracked in the new Changes tab.
  • Added support for the Storage Access API on desktop platforms.
Android
  • Improved performance: Scrolling is faster and more responsive
  • Improved performance and web compatibility, with support for the WebP image format
  • Restored Chromecast controls to the location bar.
65.0.1 February 12, 2019 Off-cycle security and stability update.[820][821]
  • Fixed accidental requests to addons.mozilla.org when an addon recommendation doorhanger is shown
  • Improved playback of interactive Netflix videos
  • Fixed color management not working on macOS
  • Fixed incorrect sizing of the "Clear Recent History" window in some situations
  • Fixed audio & video delays while making WebRTC calls
  • Fixed video sizing problems during some WebRTC calls
  • Fixed looping CONNECT requests when using WebSockets over HTTP/2 from behind a proxy server
  • Fixed the "Enter" key not working on password entry fields for certain Linux distributions
  • Various stability and security fixes
  • Made support for <meta> viewport tags in Responsive Design Mode, initially enabled in Firefox 64, pref-controlled and off by default
Android
  • Fixed looping CONNECT requests when using WebSockets over HTTP/2 from behind a proxy server
  • Various stability and security fixes
65.0.2 February 28, 2019 Off-cycle stability update.[822]
Desktop
  • Fixed an issue with geolocation services affecting Windows users

End-of-life 65.0.x product line[not in citation given (See discussion.)] on March 19, 2019.

66.0 March 19, 2019 Official Firefox 66.0 release.[823][824]
  • Firefox now prevents websites from automatically playing sound
  • Improved search experience:
    • Find a specific webpage faster when you have a lot of tabs open
    • Easier search via a redesigned new tab in Private Windows
  • Smoother scrolling: Scroll anchoring keeps content from jumping as images and ads load at the top of the page
  • Improved performance and better user experience for extensions:
    • Extensions now store their settings in a Firefox database, rather than individual JSON files, making every site you visit faster
    • A redesigned keyboard shortcuts section in about:addons makes it easier to view and adjust default shortcuts
  • Redesigned certificate error pages help you better understand and resolve issues, including identification of certificate issuers for anti-virus software
  • Added basic support for macOS Touch Bar
  • Experimenting with an improved Pocket experience in New Tab with different layouts and more topical content
  • Improved performance and reduced crash rates by doubling web content loading processes from 4 to 8
  • Easier, passwordless security: Added support for Windows Hello on Windows 10
  • Enabled AV1 support on 32-bit Windows and MacOS
  • The Dark and Light Firefox themes now override the system setting for title bar accent color on Windows 10
  • Linux users: Resolved an issue that caused Firefox to freeze when downloading files
  • Various security fixes
  • System title bar is hidden by default to match Gnome guideline for Linux users
  • DevTools Inspector is now fully usable when the Debugger is paused
  • Lowered priority of setTimeout and setInterval during page load to improve overall page load performance
  • Fixed: <button> element is no longer special cased in event dispatch, per latest specifications
Android
  • Added support to open files from external storage, such as an SD card
66.0.1 March 22, 2019 Off-cycle security update.[825][826]
  • Various security fixes
66.0.2 March 27, 2019 Off-cycle stability update.[827][828]
  • Fixed Web compatibility issues with Office 365, iCloud and IBM WebMail caused by recent changes to the handling of keyboard events
  • Crash fixes
Android
  • Fixed frequent crashes on sites using the OpenH264 video codec for WebRTC

End-of-life 66.0.x product line[not in citation given (See discussion.)] on May 14, 2019.

66.0.3 April 10, 2019 Off-cycle stability update.[829]
Desktop
  • Address bar on tablets running Windows 10 now behaves correctly
  • Fixed performance issues with some HTML5 games
  • Fixed a bug with keypress events in IBM cloud applications
  • Fix for keypress events in some Microsoft cloud applications
  • Updated Baidu search plugin


Legend:   Former release   Extended Support Release (ESR)   Current   Beta   Future official release   Future test release Top

Future releases[edit]

The following information has been released about upcoming versions of Firefox. All dates in the future are scheduled release dates that are subject to change.

CPU architectures[edit]

x86 family[edit]

Native 64-bit builds are officially supported on Linux, macOS, and Windows (since version 42).[830][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][831] Since being labeled tier 1, Mozilla has been providing official 64-bit releases for its browser for Linux.[832][833] 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 64-bit support, 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.[834][835]

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.[836] As of April 19, 2017, Firefox 53 has dropped support for 32-bit macOS.[837]

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[838] but later reversed the decision.[839] As of April 2015, 64-bit Windows builds are available as 38.0 Beta[840] 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-bit and 64-bit versions.[841]

Other CPU architectures[edit]

Besides x86, Firefox also supported other CPU architectures including ARMv7, SPARC, PowerPC, and 68k on different tiers.[842] 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.

Release compatibility[edit]

Operating system Latest stable version Support status
Windows 7 and later, Server 2008 R2 and later Current stable version: 66.0.3 (x64)[843] 2015–
Older version, yet still supported: 60.6.1esr (x64)[844]
Current stable version: 66.0.3 (IA-32) 2009–
Older version, yet still supported: 60.6.1esr (IA-32)
XP SP2 and SP3, Vista,
Server 2003, and Server 2008
Old version, no longer supported: 52.9.0esr (IA-32) 2004–2018
Old version, no longer supported: 52.0.2 (IA-32)[845] 2004–2017
2000, XP RTM and SP1 Old version, no longer supported: 10.0.12esr 2004–2013
Old version, no longer supported: 12.0[846] 2004–2012
NT 4 (IA-32), 98 and ME Old version, no longer supported: 2.0.0.20 2004–2008
95 Old version, no longer supported: 1.5.0.12 2004–2007
macOS 10.910.14 Current stable version: 66.0.3[843] 2013–
Older version, yet still supported: 60.6.1esr[844]
10.610.8 Old version, no longer supported: 45.9.0esr[847] 2009–2017
Old version, no longer supported: 47.0.1[848] 2009–2016
10.5 (IA-32,x64) Old version, no longer supported: 10.0.12esr 2007–2013
Old version, no longer supported: 16.0.2[849] 2007–2012
10.4 (IA-32,PPC)–10.5 (PPC) Old version, no longer supported: 3.6.28[850][851] 2005–2012
10.210.3 Old version, no longer supported: 2.0.0.20 2004–2008
10.010.1 Old version, no longer supported: 1.0.8 2004–2006
Linux desktop Current stable version: 66.0.3 (x64)[843] 2011–
Older version, yet still supported: 60.6.1esr (x64)[844]
Current stable version: 66.0.3 (IA-32) 2004–
Older version, yet still supported: 60.6.1esr (IA-32)
Legend:
Old version
Older version, still supported
Latest version
Latest preview version
Future release

Notes

  • In March 2014, the Windows Store app version of Firefox was cancelled, although there is a beta release.[852]
  • SSE2 instruction set support is required for 53.0 and later, IA-32 support only applies to superscalar processors.

For mobile platforms[edit]

Operating system Latest stable version Support status
Android
(including Android-x86)
5.0 and later[853] Current stable version: 66.0.2 (ARMv8-A) 2017–
4.1 and later Current stable version: 66.0.2 (IA-32)[854] 2013–
Current stable version: 66.0.2 (ARMv7) 2012–
4.0 Old version, no longer supported: 55.0.2 (IA-32)[854][855] 2013–2017
Old version, no longer supported: 55.0.2 (ARMv7) 2011–2017
3.0–3.2 Old version, no longer supported: 45.0.2 (ARMv7)[854] 2011–2016
2.3 Old version, no longer supported: 47.0 (ARMv7)[854][856] 2011–2016
2.24.3 Old version, no longer supported: 31.3.0esr (ARMv6) 2012–2015
2.2 Old version, no longer supported: 31.0 (ARMv7)[857] 2011–2014
2.1 Old version, no longer supported: 19.0.2 (ARMv6) 2012–2013
Old version, no longer supported: 19.0.2 (ARMv7) 2011–2013
2.0 Old version, no longer supported: 6.0.2 (ARMv7) 2011
Firefox OS 2.2 Old version, no longer supported: 35/36/37 2015
2.1 Old version, no longer supported: 33/34 2014–2015
2.0 Old version, no longer supported: 31/32 2014–2015
Maemo Old version, no longer supported: 7.0 2010–2011
Legend:
Old version
Older version, still supported
Latest version
Latest preview version
Future release
Notes
  • Firefox for iOS is not listed in this table as its version numbers would be misleading; it uses version numbers that do not correspond to any of the other Firefox versions. Those share a core component, the Gecko rendering engine, and track its version numbers, whereas the version for the iOS operating system uses the operating system's rendering engine (WebKit), rather than Mozilla's (Gecko).

Unofficial ports[edit]

Operating system Latest stable version Support status
Solaris 10–11 and OpenSolaris Older version, yet still supported: 60.6.1esr (IA-32,SPARC V9) 2005–
8–9 Old version, no longer supported: 2.0.0.20 (IA-32,SPARC V9) 2004–2008
HP-UX 11i v2–v3 Old version, no longer supported: 3.5.9 (IA-64,PA-RISC)[858] N/A
FreeBSD (DragonFly BSD) 12 Current stable version: 66.0.3 (IA-32) and 66.0.3 (x64) 2018–
Older version, yet still supported: 60.6.1esr (IA-32) and 60.6.1esr (x64)
11 Current stable version: 66.0.3 (IA-32) and 66.0.3 (x64) 2016–
Older version, yet still supported: 60.6.1esr (IA-32) and 60.6.1esr (x64)
OpenBSD 6.4 Older version, yet still supported: 60.6.1esr (IA-32,x64) 2018–
5.8 Old version, no longer supported: 38.7.1esr (PPC) 2015–2016
5.7 Old version, no longer supported: 31.6.0esr (SPARC V9) 2015
5.1 Old version, no longer supported: 3.6.25 (Alpha) N/A
Legend:
Old version
Older version, still supported
Latest version
Latest preview version
Future release

Mozilla Firefox timeline[edit]


Security Bug Bounty Program[edit]

In the Mozilla Security Bug Bounty Program, a bounty payment is offered to those reporting 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".[859]

See also[edit]

Notes[edit]

  1. ^ a b c d e f g h i j k l m n o p q r s 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.

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