Mozilla Add-ons

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For the technology behind extensions and other add-ons, see add-on (Mozilla).
Add-ons for Firefox
Web address
Commercial? No
Type of site
Extension hosting
Registration Free; only needed for developers or for special features
Owner Mozilla Foundation
Created by Andy McKay, Chris Howse, Gregory Koberger, Jeff Balogh, Jorge Villalobos (jorgev), Justin Scott (fligtar), Kumar McMillan, Matt Claypotch, Stephen Donner, Wil Clouser, et al.[1]
Current status Active

Mozilla Add-ons is the official Mozilla Foundation website to act as a repository for add-ons for Mozilla software, including Mozilla Firefox, Mozilla Thunderbird, SeaMonkey, and Mozilla Sunbird. These add-ons include extensions, themes, dictionaries, search bar "search engines," and plugins. Because of its domain name, the site is informally also known as AMO.[2]

In contrast to which provides free hosting for Mozilla-related projects, Mozilla Add-ons is targeted to end-users, not just software developers. Many Mozilla applications contain direct links to the website, and contain settings to poll for updates to the extensions and the application itself.[citation needed] Firefox 3 includes features for retrieving and displaying content from the website in the add-on manager.[3]

On January 30, 2008, it was announced that over 600 million add-ons had been downloaded from the site and that over 100 million add-ons automatically check the site for updates every day.[4][clarification needed]]]

On July 26, 2012, Mozilla announced that 3 billion add-ons were downloaded from the site.[5]


Formerly, Mozilla Add-ons was known as Mozilla Update (or UMO, as the hostname was The site underwent several changes between its launch and when it became the AMO.[6]

  • A major rewrite of the public pages was launched on April 4, 2006.
  • A visual refresh of the Firefox pages was pushed on October 24, 2006 to correspond with the launch of Firefox 2 and the newly styled
  • A complete rewrite of both the developer and public pages, codenamed Remora,[7] was launched on March 23, 2007.
  • Another visual refresh, "Remora 3.2", launched spring 2008.
  • In 2011, Remora (written in PHP/CakePHP) was replaced with Zamboni (written in Python/Django).[8] The site also featured a redesign,[9] codenamed Impala.


  1. ^ "Site Credits". Mozilla Add-ons. Mozilla Foundation. Retrieved 16 February 2011. 
  2. ^ "MozillaWiki: AMO Wiki". Retrieved 2008-07-07. 
  3. ^ "Customizing your Firefox with add-ons: Acquiring add-ons". Retrieved 2008-07-07. [dead link]
  4. ^ "600,000,000 Add-on Downloads < Blog of Metrics". 
  5. ^ "Firefox Add-ons Cross More Than 3 Billion Downloads!". The Mozilla blog. Retrieved 1 November 2013. 
  6. ^ "MozillaWiki: AMO Roadmap". Retrieved 2008-07-07. 
  7. ^ "MozillaWiki: Remora". Retrieved 2008-07-07. 
  8. ^ "Traces of a new AMO". 
  9. ^ "Previewing AMO's new look". 

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