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

January 26, 2017

Version 51.0.1, first offered to Release channel users on January 26, 2017

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


  • Reference link to 51.0 release notes

  • Geolocation not working on Windows (Bug 1333516)

  • Multiprocess incompatibility did not correctly register with some add-ons (Bug 1333423)


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