Firefox ESR
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 ESR

December 21, 2015

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


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

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