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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 Extended Support Release Release

December 21, 2015

Version 38.5.1, first offered to Release channel users on December 21, 2015


  • Prepare to use SHA-256 signing certificate for Windows builds, to meet new signing requirement (1079858)