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.

Your system may not meet the requirements for Firefox, but you can try one of these versions:

Your system doesn't meet the requirements to run Firefox.

Your system doesn't meet the requirements to run Firefox.

Please follow these instructions to install Firefox.

Firefox Privacy Notice


Firefox Release

May 14, 2015

Version 38.0.1, first offered to Release channel users on May 14, 2015

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


  • Systems with first generation NVidia Optimus graphics cards may crash on start-up (1154703)

  • Users who import cookies from Google Chrome can end up with broken websites (1162205)

  • Large animated images may fail to play and may stop other images from loading (1161859)

  • WebRTC H264 video streams from CiscoSpark native clients are not decoded correctly. (Fixed in Firefox ESR 38.0.1; was already fixed in Firefox 38.0) (1162251)


  • Responsive images do not update when the enclosing viewport changes