Mozilla sent Firefox Version 21.0 to the release channel. The current update information does not indicate that security updates are included.
Update: The security updates were posted after this was published. The update includes eight (8) security updates, in which three are critical, four high and one moderate. The security updates are listed below.
Fixed in Firefox 21MFSA 2013-48 Memory corruption found using Address Sanitizer
MFSA 2013-47 Uninitialized functions in DOMSVGZoomEvent
MFSA 2013-46 Use-after-free with video and onresize event
MFSA 2013-45 Mozilla Updater fails to update some Windows Registry entries
MFSA 2013-44 Local privilege escalation through Mozilla Maintenance Service
MFSA 2013-43 File input control has access to full path
MFSA 2013-42 Privileged access for content level constructor
MFSA 2013-41 Miscellaneous memory safety hazards (rv:21.0 / rv:17.0.6)
- 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
- 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)
UpdateTo get the update now, select "Help" from the Firefox menu at the upper left of the browser window, then pick "About Firefox." Mac users need to select "About Firefox" from the Firefox menu.
If you do not use the English language version, Fully Localized Versions are available for download.