View notes for:

Firefox Notes (First offered to release channel users on November 30, 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

  • FIXED
    17.0.1: Font rendering issue in Firefox 17.0 (bug 814101)
  • FIXED
    17.0.1: Reverted user agent change causing some website incompatibilities
  • NEW
    First revision of the Social API and support for Facebook Messenger
  • NEW
    Click-to-play blocklisting implemented to prevent vulnerable plugin versions from running without the user's permission (see blog post)
  • CHANGED
    Updated Awesome Bar experience with larger icons
  • CHANGED
    Mac OS X 10.5 is no longer supported
  • DEVELOPER
    JavaScript Maps and Sets are now iterable
  • DEVELOPER
    SVG FillPaint and StrokePaint implemented
  • DEVELOPER
    Improvements that make the Web Console, Debugger and Developer Toolbar faster and easier to use
  • DEVELOPER
    New Markup panel in the Page Inspector allows easy editing of the DOM
  • HTML5
    Sandbox attribute for iframes implemented, enabling increased security
  • FIXED
    Over twenty performance improvements, including fixes around the New Tab page
  • FIXED
    17.0.1: Leaving Private Browsing with Social API enabled should reset social components (815042)
  • FIXED
    Pointer lock doesn't work in web apps (769150)
  • FIXED
    Page scrolling on sites with fixed headers (780345)

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)