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 Release

May 19, 2017

Version 53.0.3, first offered to Release channel users on May 19, 2017


  • Fix excessive resource usage from the captive portal detection service (bug 1359697)

  • FIx hangs when using a proxy with NTLM authentication (bug 1360574)


  • Bump preloaded security information expiration times (bug 1364240)