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Firefox Notes (First offered to release channel users on February 13, 2014)

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.

We'd also like extend a special thank you to all of the new Mozillians who contributed to Firefox 27!

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

What’s New

  • FIXED
    27.0.1 - Fixed stability issues with Greasemonkey and other JS that used ClearTimeoutOrInterval
  • FIXED
    27.0.1 - JS math correctness issue (bug 941381
  • NEW
    You can now run more than one service at a time with Firefox SocialAPI, allowing you to receive notifications, chat and more from multiple integrated services
  • CHANGED
    Enabled TLS 1.1 (RFC 4346) and TLS 1.2 (RFC 5246) by default
  • CHANGED
    Added support for SPDY 3.1 protocol
  • DEVELOPER
    Ability to reset style sheets using 'all:unset'
  • DEVELOPER
    You can now choose to deobfuscate javascript in the debugger (see 762761)
  • DEVELOPER
    Added support for scrolled fieldsets (see 261037)
  • DEVELOPER
    Implemented allow-popups directive for iframe sandbox, enabling increased security (see 766282)
  • DEVELOPER
    CSS cursor keywords -moz-grab and -moz-grabbing have been unprefixed (see 880672)
  • DEVELOPER
    Added support for ES6 generators in SpiderMonkey (see blog post)
  • DEVELOPER
    Implemented support for mathematical function Math.hypot() in ES6 (see 896264)
  • HTML5
    Dashed line support on Canvas (see 768067)
  • FIXED
    Get Azure/Skia content rendering working on Linux (see 740200)
  • FIXED
    Various security fixes

Known Issues

  • Unresolved
    Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1 has a workaround (see 812695)