View notes for:

Firefox Notes (First offered to release channel users on January 8, 2013)

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
    Faster JavaScript performance via IonMonkey compiler
  • NEW
    Support for Retina Display on OS X 10.7 and up
  • NEW
    Preliminary support for WebRTC
  • CHANGED
    Performance improvements around tab switching
  • DEVELOPER
    Support for new DOM property window.devicePixelRatio
  • DEVELOPER
    Improvement in startup time through smart handling of signed extension certificates
  • HTML5
    Support for W3C touch events implemented, taking the place of MozTouch events
  • FIXED
    Support for disabling insecure content loads on HTTPS pages through an about:config pref (62178)
  • FIXED
    Improved responsiveness for users on proxies (769764)

Known Issues

  • Unresolved
    Certain valid WebGL drawing operations are incorrectly rejected, leaving incomplete rendering in affected pages (see 825205)
  • Unresolved
    If you try to start Firefox using a locked profile, it will crash (see 573369)
  • Unresolved
    Animated Personas or Themes now require a workaround. See this support page
  • 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)
  • Unresolved
    Starting Firefox with -private flag incorrectly claims you are not in Private Browsing mode (see 802274)
    Unresolved on v18 Resolved in v19
  • Unresolved
    Plugins stop rendering when the top half of the plugin is scrolled off the top of the page, in HiDPI mode (see 825734)
  • Unresolved
    Mootools 1.2.x incompatible with Firefox 18 and newer.Fixed in Mootools 1.3 and newer (see 789036)