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 Developer Edition

November 18, 2016

Version 52.0a2, first offered to Firefox Developer Edition channel users on November 18, 2016

For more information about Developer Edition please see this MDN article.



  • Removed Battery Status API to reduce fingerprinting of users by trackers

  • Removed NPAPI support for plugins other than Flash - Silverlight, Java, Acrobat and the like are no longer supported.

  • Implemented the Strict Secure Cookies spec which forbids insecure (http:) sites from setting cookies with the "secure" attribute, and in some cases prevents an insecure site from setting a cookie with the same name as an existing "secure" cookie from the same base domain.


Developer Information