Release Highlights
Firefox 21 includes the following:
- More Do Not Track Options: Do Not Track includes three options "Do Track," "Do Not Track" and "no preference" to better represent user’s choice to opt-in or opt-out of online tracking. To access the Do Not Track options and indicate your preference click on "preferences" then "privacy."
- Restore thumbnails on new tab page: If you close a tab thumbnail on the new tab page there will be an option to "undo" and restore your thumbnail.
Note: Firefox 21 Final is scheduled to be released on May 14, 2013.
Download Firefox 21 Beta 7:
The links in this section correspond to files available for this download. Download the files appropriate for you.
Firefox 21 Beta (Running on Windows 8)
Note: Please do NOT use this Firefox Beta release on production machines. A Firefox Beta release should be considered for evaluation and testing purposes.
What's new features in Firefox 21 Beta?
Firefox 21 Beta has the following changes:
New:
- Enhanced Three-state UI for Do Not Track (DNT)
- Firefox will suggest how to improve your application startup time if needed
- Preliminary implementation of Firefox Health Report (see FAQ)
Changed:
- Ability to Restore removed thumbnails on New tab Page
- Add-ons History API removals in Places
- CSS -moz-user-select:none selection changed to improve compatibility with -webkit-user-select:none (bugs 816298)
- Graphics related performance improvements (bugs 809821)
- Removed E4X support from SpiderMonkey
Developer:
- Implemented Remote Profiling
- Integrated, Add-on SDK loader and API libraries into Firefox
HTML5:
- Added support for element
- Implemented scoped stylesheets
Fixed:
- Some function keys may not work when pressed (833719)
- Browsing and Download history clearing needs unification to avoid confusion on clearing download history (847627)
References:
Firefox 21 Beta Release Notes.
Firefox Beta Includes Changes to the Do Not Track Options
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