Firefox Release Notes

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

December 15, 2015

Version 43.0, first offered to Release channel users on December 15, 2015

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


  • Private Browsing with Tracking Protection offers choice of blocking additional trackers

  • Improved API support for m4v video playback

  • Firefox 64-bit for Windows is now available via the Firefox download page

  • Users can choose search suggestions from the Awesome Bar

  • On-screen keyboard displayed on selecting input field on devices running Windows 8 or greater

  • Firefox Health Report has switched to use the same data collection mechanism as telemetry


  • Eyedropper tool does not work as expected when page is zoomed

  • Various security fixes


All Firefox downloads