版本历史 Firefox 21.0

What’s New

  • NEW The Social API now supports multiple providers
  • NEW Enhanced three-state UI for Do Not Track (DNT)
  • NEW Firefox will suggest how to improve your application startup time if needed
  • NEW Preliminary implementation of Firefox Health Report
  • CHANGED Ability to restore removed thumbnails on New Tab Page
  • CHANGED CSS -moz-user-select:none selection changed to improve compatibility with -webkit-user-select:none (bug 816298)
  • CHANGED Graphics related performance improvements (bug 809821)
  • CHANGED Removed E4X support from Spidermonkey
  • DEVELOPER Implemented Remote Profiling
  • DEVELOPER Integrated add-on SDK loader and API libraries into Firefox
  • HTML5 Added support for element
  • HTML5 Implemented scoped stylesheets
  • HTML5 Added support for window.crypto.getRandomValues
  • FIXED Some function keys may not work when pressed (833719)
  • FIXED Browsing and Download history clearing needs unification to avoid confusion on clearing download history (847627)
  • FIXED 21.0: Security fixes can be found here

Known Issues

  • UNRESOLVED Unreadable text for some italic-styled text on Hebrew Windows system (see 837498)
    • Unresolved on v21  Resolved in v22
  • UNRESOLVED Fullscreen playback support for Nvidia HTML 5 Stereo Mode on 3D videos on YouTube is broken (see 869866)
  • UNRESOLVED If you try to start Firefox using a locked profile, it will crash (see 573369)
  • UNRESOLVED Download statusbar add-on continues downloading files from Normal Browsing, when switching to Private Browsing (see 853463)