-
NEW
The Social API now supports multiple providers
-
NEW
Enhanced three-state UI for Do Not Track (DNT)
-
NEW
Firefox will suggest how to improve your application startup time if needed
-
NEW
Preliminary implementation of Firefox Health Report
-
CHANGED
Ability to restore removed thumbnails on New Tab Page
-
CHANGED
CSS -moz-user-select:none selection changed to improve compatibility with -webkit-user-select:none (bug 816298)
-
CHANGED
Graphics related performance improvements (bug 809821)
-
CHANGED
Removed E4X support from Spidermonkey
-
DEVELOPER
Implemented Remote Profiling
-
DEVELOPER
Integrated add-on SDK loader and API libraries into Firefox
-
HTML5
Added support for <main> element
-
HTML5
Implemented scoped stylesheets
-
HTML5
Added support for window.crypto.getRandomValues
-
FIXED
Some function keys may not work when pressed (833719)
-
FIXED
Browsing and Download history clearing needs unification to avoid confusion on clearing download history (847627)
- FIXED
21.0: Security fixes can be found here
What’s New
Known Issues
-
Unresolved
Unreadable text for some italic-styled text on Hebrew Windows system (see 837498)
Unresolved on v21 Resolved in v22 -
Unresolved
Fullscreen playback support for Nvidia HTML 5 Stereo Mode on 3D videos on YouTube is broken (see 869866)
-
Unresolved
If you try to start Firefox using a locked profile, it will crash (see 573369)
-
Unresolved
Download statusbar add-on continues downloading files from Normal Browsing, when switching to Private Browsing (see 853463)