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Shared components used by Firefox and other Mozilla software, including handling of Web content; Gecko, HTML, CSS, layout, DOM, scripts, images, networking, etc. Issues with web page layout probably go here, while Firefox user interface issues belong in the Firefox product. (More info)


For bugs in Firefox Desktop, the Mozilla Foundation's web browser. For Firefox user interface issues in menus, developer tools, bookmarks, location bar, and preferences. Many Firefox bugs will either be filed here or in the Core product. (more info)

Firefox for Android

Firefox for Android is a mobile version of Firefox for Android devices. (more info)

Firefox for iOS

Firefox for iOS is the Firefox mobile experience developed for the iOS platform.


The Mozilla Toolkit is a set of APIs, built on top of Gecko, which provide advanced services to XUL applications. These services include Profile Management, Chrome Registration, Browsing History, Extension and Theme Management, Application Update Service, and Safe Mode. (More info)

Mozilla Localizations

Translation, spelling and other errors in language packs and localized builds (more info)

Data Platform and Tools

Bugs for Telemetry Components

Data Science

Requests for the Data Science Team. If you are unsure of which component to choose please select General.


Email client originally developed by the Mozilla Foundation and now maintained by its community. (more info)


An all-in-one internet application suite, including web browser, e-mail and newsgroup client, and HTML composer. (more info)

Other Products

Other Mozilla products which aren't listed here