See what’s new in Firefox!

Release Notes tell you what’s new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release.


Firefox Release

September 22, 2015

Version 41.0, first offered to Release channel users on September 22, 2015

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


  • Enhance IME support on Windows (Vista +) using TSF (Text Services Framework)

  • Ability to set a profile picture for your Firefox Account

  • Firefox Hello now includes instant messaging

  • Improved box-shadow rendering performance

  • SVG images can be used as favicons


  • Picture element does not react to resize/viewport changes

  • Various security fixes


  • WARP is disabled on Windows 7

  • Updates to image decoding process

  • WebRTC now requires perfect forward secrecy

  • Support for running animations of 'transform' and 'opacity' on the compositor thread


  • Network requests can be exported in HAR format

  • Quickly add new CSS rule with New Rule button in the Inspector

  • Screenshot a node or element from markup view with the Screenshot Node context menu item

  • Copy element CSS rule declarations with the Copy Rule Declaration context menu item in the Inspector

  • Pseudo-Class panel in the Inspector

  • Removed support for binary XPCOM components in extensions, use addon SDK "system/child_process" pipe mechanism for native binaries instead

Developer Information