Overview

Firefox offers an Extended Support Release (ESR) for organizations, including schools, universities, businesses and others who need extended support for mass deployments. Firefox ESR can be downloaded here. The ESR release is based on the regular release cycle of Firefox for desktop.

Release cycle details

ESR releases are maintained for more than a year, with point releases that coincide with regular Firefox releases. These point releases contain security upgrades.

The ESR version will also have an overlap of at least 12 weeks between the release of a new ESR version and the end-of-life of the previous ESR version. This overlap provides organizations time to test and certify the new version before deployment.

We rely on Firefox ESR users to provide feedback for each new ESR release. During the first eight weeks, please report any bugs such as web compatibility regressions and stability issues.

Maintenance of each ESR through point releases is limited to high-risk/high-impact security vulnerabilities, and in rare cases may also include off-schedule releases that address live security vulnerabilities. Backports of any functional enhancements and/or stability fixes are not in scope.

At the end of the support period for an ESR version:

• the release will reach its end-of-life
• no further updates will be offered for that version
• an update to the next version will be offered through the application update service

You can read more about the ESR landing process here.

Upgrade path between two ESR versions

An ESR version will be automatically upgraded to the subsequent ESR version near the end of the 12-week overlap period. System administrators can disable automatic updates by managing ESR through their deployment system. See the Firefox release calendar for specific release dates.