View notes for:

Firefox Beta Desktop Notes (First offered to Beta channel users on January 10, 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.

What’s New

  • NEW
    Built-in PDF viewer
  • CHANGED
    Canvas elements can export their content as an image blob using canvas.toBlob()
  • CHANGED
    Startup performance improvements (bugs 715402 and 756313)
  • DEVELOPER
    Debugger now supports pausing on exceptions and hiding non-enumerable properties
  • DEVELOPER
    Remote Web Console is available for connecting to Firefox on Android or Firefox OS (experimental, set devtools.debugger.remote-enabled to true)
  • DEVELOPER
    There is now a Browser Debugger available for add-on and browser developers (experimental, set devtools.chrome.enabled to true)
  • DEVELOPER
    Web Console CSS links now open in the Style Editor
  • HTML5
    CSS @page is now supported
  • HTML5
    CSS viewport-percentage length units implemented (vh, vw, vmin and vmax)
  • HTML5
    CSS text-transform now supports full-width
  • FIXED
    Starting Firefox with -private flag incorrectly claims you are not in Private Browsing mode (802274)

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
    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
    Plugins stop rendering when the top half of the plugin is scrolled off the top of the page, in HiDPI mode (see 825734)