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Firefox add-ons

Add-ons for Firefox
Mozilla Add-ons.png
Screenshot of Mozilla Add-ons website
Type of site
Extensions and themes hosting
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.
Website addons.mozilla.org
Commercial No
Registration Free; only needed for developers or for special features
Current status Active

Mozilla add-ons are installable enhancements to the Mozilla Foundation's projects, including Firefox, Thunderbird, SeaMonkey, and Sunbird. Add-ons allow the user to add or augment application features, use themes to their liking, and handle new types of content.

There are three major categories of add-ons: "Extensions", "Themes", and "Plugins". The main repository for distributing the first two type is the eponymous Mozilla Add-ons website.

There are several types of add-ons:

The eponymous Mozilla Add-ons website is the official Mozilla Foundation repository for add-ons of Mozilla software, including Mozilla Firefox, Mozilla Thunderbird, SeaMonkey, and Mozilla Sunbird. These add-ons include Mozilla extensions and personas, but not Mozilla plug-ins.

In contrast to mozdev.org 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. Firefox 3 includes features for retrieving and displaying content from the website in the add-ons manager.

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.

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

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


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