Firefox ESR
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.

Download Firefox — English (US)

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

Download Firefox — English (US)

Firefox is no longer supported on Windows 8.1 and below.

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

Download Firefox ESR 64-bit

Download Firefox ESR 32-bit

Download a different build

Firefox is no longer supported on macOS 10.14 and below.

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

Download Firefox ESR

Firefox Privacy Notice

Version 78.5.0, first offered to ESR channel users on November 17, 2020

Various stability, functionality, and security fixes

Developer Information

Get the most recent version

Download Firefox — English (US)

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

Download Firefox — English (US)

Firefox is no longer supported on Windows 8.1 and below.

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

Download Firefox ESR 64-bit

Download Firefox ESR 32-bit

Download a different build

Firefox is no longer supported on macOS 10.14 and below.

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

Download Firefox ESR

Firefox Privacy Notice

All Firefox ESR downloads

Firefox for Desktop

Firefox for iOS

Firefox for Android

Firefox Focus

Firefox blog

Mozilla VPN

Mozilla Monitor

Firefox Relay

Pocket

MDN Plus

Fakespot

Thunderbird

About Mozilla

The Mozilla Manifesto

Get Involved

Blog

Mozilla Foundation

Mozilla.ai

Mozilla Ventures

Mozilla Advertising

Mozilla Builders

Mozilla New Products

Firefox ESR
Release Notes

78.5.0 Firefox ESR

Fixed

Developer

Get the most recent version