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 Extended Support Release ESR

March 21, 2015

Version 31.5.3, first offered to ESR channel users on March 21, 2015


  • Security fixes for issues disclosed at HP Zero Day Initiative's Pwn2Own contest