Download Firefox

Firefox is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox Privacy Notice

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.

40.0.3
Firefox Release

August 27, 2015

Version 40.0.3, first offered to Release channel users on August 27, 2015

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 a segmentation fault in the GStreamer support (GNU/Linux) (1145230)

  • Fix a startup crash when using DisplayLink (Windows Only) (1195844)

  • Fix a regression with some Japanese fonts used in the <input> field (1194055)

  • On some sites, the selection in a select combox box using the mouse could be broken (1194733)

  • Some search partner codes were missing (1195683)

  • Various security fixes

Changed

  • Disable the asynchronous plugin initialization (1198590)

Get the most recent version

All Firefox downloads