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

April 10, 2019

Version 66.0.3, first offered to Release channel users on April 10, 2019


  • Address bar on tablets running Windows 10 now behaves correctly (Bug 1498973)

  • Performance issues with some HTML5 games (Bug 1537609)

  • Fixed a bug with keypress events in IBM cloud applications (Bug 1538970)

  • Fix for keypress events in some Microsoft cloud applications (Bug 1539618)


  • Updated Baidu search plugin

All Firefox downloads