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Mozilla will offer an Extended Support Release (ESR) based on a regular release of Firefox for desktop for use by organizations including schools, universities, businesses and others who need extended support for mass deployments.
You can download Mozilla Firefox ESR here.
Releases will be maintained for more than a year, with point releases containing security updates coinciding with regular Firefox releases. The ESR will also have a two cycles (12 week) overlap between the time of a new release and the end-of-life of the previous release to permit testing and certification prior to deploying a new version.
Mozilla relies on Firefox ESR users to provide feedback for the new ESR releases. During the first two cycles, please report any bugs about web compatibility regressions, stability issues, and so on.
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:
You can read more about the plan here.
Mozilla Firefox ESR is meant for organizations that manage their client desktops, including schools, businesses and other institutions that want to offer Firefox. Users who want to get the latest features, performance enhancements and technologies in their browsing experience should download Firefox for personal use, as these improvements will only be available to ESR users several development cycles after being made available in Firefox for desktop. If you’re using Firefox for personal use, you can download Firefox from mozilla.org/firefox.
In some cases, ESR is proposed to regular users for unsupported architectures transition. For example, when Windows XP support ended for the release, Firefox ESR has been recommended for these users.
System administrators who deploy Firefox ESR are encouraged to sign up for the Enterprise mailing list and test Beta versions of Firefox and ESR Release Candidates. You can also file bugs for issues you may encounter here or follow known bugs here.
To learn about the latest Mozilla Firefox ESR news, administrators are encouraged to subscribe to the Mozilla Enterprise mailing list available in English, French and German. This is where Mozilla communicates the latest information about Firefox ESR and other product updates.
The Mozilla Enterprise mailing list run by the Mozilla Enterprise User Working Group (EWG) is where enterprise developers, IT staff, and Firefox developers discuss best practices for deploying Firefox in the enterprise.
Mozilla Firefox ESR support can be found through the mailing list. As Firefox ESR is (almost) functionally identical to Firefox for desktop, users will be able to find relevant support articles here.
Firefox and Firefox ESR are extremely similar. Rarely, some features are disabled in ESR for different reasons like stability issues, potential changes in the specifications, etc. Any differences between the regular release and ESR are documented in the release notes of the first ESR release of the cycle.
On Windows, the recommended way to customize Firefox is through Group Policy. For other platforms, the policy support is implemented using a JSON file called policies.json. The best place to start is the documentation on support.mozilla.org or Enterprise list. There are also third-party organizations who provide customization services, and the Enterprise list is a good place to discuss requirements if you’re just getting started.
Yes, an ESR will be automatically upgraded to the subsequent ESR. System administrators can disable automatic updates by managing ESR through their deployment system. From a major version to the other (example: the 52 to 60 migration), the updates will be proposed only after the X.2.0 version is released. For example, users of 52 have been updated only when 60.2.0 has been published.
Firefox ESR is available in every locale currently available for Firefox. Because of the precise needs of ESR, it’s encouraged for system administrators deploying the build to register and participate in an mailing list. This is only available in English, French and German, but if you would like to volunteer to lead an Enterprise mailing list in your language, please get in touch.
Visit your language’s mailing list linked above and fill the unsubscription form at the bottom of the page, or send an email to the list moderator as instructed at the bottom of each post.
No. Firefox ESR will only be offered for Windows, macOS and Linux for desktop computers.
Generally speaking, yes. However, it should be noted that some web applications including popular SaaS like G Suite and Office 365 only support the latest Firefox release. If your organization is using one of those applications, please consider deploying the latest release instead of ESR to meet the requirements.