View notes for:

Firefox Notes (First offered to release channel users on June 5, 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
    When opening a new tab, users are now presented with their most visited pages
  • NEW
    The default home page now has quicker access to bookmarks, history, settings, and more
  • CHANGED
    SPDY protocol now enabled by default for faster browsing on supported sites
  • CHANGED
    Restored background tabs are not loaded by default for faster startup
  • CHANGED
    Smooth scrolling is now enabled by default
  • DEVELOPER
    72 total improvements to Page Inspector, HTML panel, Style Inspector, Scratchpad and Style Editor
  • DEVELOPER
    The column-fill CSS property has been implemented
  • DEVELOPER
    Experimental support for ECMAScript 6 Map and Set objects has been implemented
  • DEVELOPER
    Support for the CSS3 background-position property extended syntax has been added
  • DEVELOPER
    The :invalid pseudo-class can now be applied to the
    element
  • DEVELOPER
    The CSS turn <angle> unit is now supported

Known Issues

  • 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
    OS X: nsCocoaWindow::ConstrainPosition uses wrong screen in multi-display setup (see 752149)
  • Unresolved
    CSS :hover regression when an element's class name is set by Javascript (see 758885)