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.

45.0 Firefox Release

March 8, 2016

Version 45.0, first offered to Release channel users on March 8, 2016

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


  • Instant browser tab sharing through Hello

  • Tabs synced via Firefox Accounts from other devices are now shown in dropdown area of Awesome Bar when searching

  • Synced Tabs button in button bar

  • Introduce a new preference (network.dns.blockDotOnion) to allow blocking .onion at the DNS level

  • Guarani [gn] locale added


  • URLs containing a Unicode-format Internationalized Domain Name (IDN) are now properly redirected

  • Various security fixes


  • Tab Groups (Panorama) feature removed

  • [UPDATE: 3/23/2016] Firefox Hello v1.1 improvements:

    • We’ve made it easier to connect with others in FIrefox Hello by sharing a link to your Hello room using email or Facebook direct messaging
    • You can also easily stop and restart tab sharing whenever you want
    • Once you connect, you’ll see your room participants’ mouse cursor and they’ll see yours


Web Platform


  • On-screen keyboard support was temporarily turned off for Windows 8 and Windows 8.1

  • Trusteer Rapport is severely impacting the stability of Firefox

Get the most recent version

All Firefox downloads