Firefox 91.x — End of Life
EOLFirefox 91.x — All releases
| Version | Released | Active support | EOL date | Latest patch | Status |
|---|---|---|---|---|---|
| 91LTS | Aug 10, 2021 | — | Sep 20, 2022 | 91.13.0 | EOL |
CVEs affecting Firefox 91.x (0)
Firefox 91.x is EOL — migrate to Firefox 102.x
Firefox 102.x is the next major release. Plan your upgrade before Firefox 91.x stops receiving security patches.
Frequently asked questions
Is Firefox 91 end of life?
Yes. All Firefox 91.x releases have reached end of life and no longer receive security patches. Migrate to Firefox 102.x as soon as possible.
What CVEs affect Firefox 91?
No CVEs are currently tracked for Firefox 91.x in our database. This may mean no vulnerabilities have been recorded yet, or the data is still syncing.
What is the latest Firefox 91 version?
The latest Firefox 91.x patch release is 91.13.0, released on August 23, 2022. Always run the latest patch to benefit from all security fixes.
How to migrate from Firefox 91 to Firefox 102?
To migrate from Firefox 91 to Firefox 102: (1) review the official Firefox 102 migration guide for breaking changes, (2) update dependencies and configuration accordingly, (3) test thoroughly in a staging environment, (4) deploy with a rollback plan. Starting early gives you time to resolve compatibility issues before your current version reaches end of life.
Is it safe to run Firefox 91 in production?
No. Firefox 91 has reached end of life and security vulnerabilities are no longer patched. Upgrade to a supported version immediately.
Data sourced from endoflife.date · CVE data from NVD · EPSS from FIRST.org · KEV from CISA