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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.

53.0.3

Firefox Release

May 19, 2017

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

Today's Firefox release makes Firefox faster and more stable with a separate process for graphics compositing (the Quantum Compositor). Compact themes and tabs save screen real estate, and the redesigned permissions notification improves usability. Learn more on the Mozilla Blog.

We'd also like to extend a special thank you to all of the new Mozillians who contributed to this release of Firefox!

Fixed

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

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

Changed

  • Bump preloaded security information expiration times (bug 1364240)