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 Beta

April 21, 2017

Version 54.0beta, first offered to Beta channel users on April 21, 2017


  • Bookmarks created on mobile devices are now shown in "Mobile Bookmarks” folder in the drop down list from the toolbar and Bookmarks option in the menu bar in Desktop Firefox

  • Added Burmese (my) locale

  • Clearer and more detailed information for download items in the download panel


  • Create your own custom devices in Responsive Device Mode

  • Additional changes for web developers

Developer Information