View notes for:

Firefox Notes (First offered to release channel users on December 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.

We'd also like extend a special thank you to all of the new Mozillians who contributed to Firefox 26!

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

What’s New

  • NEW
    All Java plug-ins are defaulted to 'click to play'
  • NEW
    Password manager now supports script-generated password fields
  • NEW
    Updates can now be performed by Windows users without write permissions to Firefox install directory (requires Mozilla Maintenance Service)
  • NEW
    Support for H.264 on Linux if the appropriate gstreamer plug-ins are installed
  • CHANGED
    Support for MP3 decoding on Windows XP, completing MP3 support across Windows OS versions
  • CHANGED
    CSP implementation now supports multiple policies, including the case of both an enforced and Report-Only policy, per the spec
  • DEVELOPER
    Social API now supports Social Bookmarking for multiple providers through its SocialMarks functionality (see MDN docs)
  • DEVELOPER
    Math.ToFloat32 takes a JS value and converts it to a Float32, whenever possible
  • DEVELOPER
    There is no longer a prompt when websites use appcache
  • DEVELOPER
    Support for the CSS image orientation property
  • DEVELOPER
    New App Manager allows you to deploy and debug HTML5 webapps on Firefox OS phones and the Firefox OS Simulator
  • DEVELOPER
    IndexedDB can now be used as a "optimistic" storage area so it doesn't require any prompts and data is stored in a pool with LRU eviction policy, in short temporary storage
  • FIXED
    When displaying a standalone image, Firefox matches the EXIF orientation information contained within the JPEG image (298619)
  • FIXED
    Improved page load times due to no longer decoding images that aren't visible (847223)
  • FIXED
    AudioToolbox MP3 backend for OSX (914479)
  • 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)