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 ESR

December 22, 2015

Version 38.5.2, first offered to ESR channel users on December 22, 2015


  • Use a SHA-256 signing certificate for Windows builds, to meet new signing requirements