View notes for:

Firefox Notes (First offered to release channel users on August 28, 2012)

Check out "What’s New" and "Known Issues" for this version of Firefox below. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla.

If interested, please see the complete list of changes in this release.

What’s New

  • NEW
    Silent, background updates
  • NEW
    Support for SPDY networking protocol v3
  • NEW
    WebGL enhancements, including compressed textures for better performance
  • NEW
    Localization in Maithili (see all available locales)
  • CHANGED
    Optimized memory usage for add-ons
  • DEVELOPER
    JavaScript debugger integrated into developer tools
  • DEVELOPER
    New layout view added to Inspector
  • DEVELOPER
    High precision event timer implemented
  • DEVELOPER
    The CSS word-break property has been implemented.
  • DEVELOPER
    New responsive design tool allows web developers to switch between desktop and mobile views of sites
  • HTML5
    Native support for the Opus audio codec added
  • HTML5
    The <audio> and <video> elements now support the played attribute
  • HTML5
    The <source> element now supports the media attribute
  • FIXED
    Focus rings keep growing when repeatedly tabbing through elements (720987)

Known Issues

  • Unresolved
    Debugger breakpoints do not catch on page reload (see 783393)
    Unresolved on v15 Resolved in v16
  • Unresolved
    If you try to start Firefox using a locked profile, it will crash (see 573369)
  • Unresolved
    For some users, scrolling in the main GMail window will be slower than usual (see 579260)
  • Unresolved
    Windows: The use of Microsoft's System Restore functionality shortly after updating Firefox may prevent future updates (see 730285)