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

March 10, 2017

Version 54.0a2, first offered to Firefox Developer Edition channel users on March 10, 2017

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


  • Media in a new opened background tab won’t be autoplayed

  • Bookmarks created on mobile devices are now shown in the bookmarks “Library” window in Desktop Firefox


  • Create your own custom devices in Responsive Device Mode

  • Changes for web developers

Developer Information