Firefox 139.x — End of Life
EOLFirefox 139.x — All releases
| Version | Released | Active support | EOL date | Latest patch | Status |
|---|---|---|---|---|---|
| 139 | May 27, 2025 | — | Jun 24, 2025 | 139.0.4 | EOL |
CVEs affecting Firefox 139.x (0)
Firefox 139.x is EOL — migrate to Firefox 140.x
Firefox 140.x is the next major release. Plan your upgrade before Firefox 139.x stops receiving security patches.
Frequently asked questions
Is Firefox 139 end of life?
Yes. All Firefox 139.x releases have reached end of life and no longer receive security patches. Migrate to Firefox 140.x as soon as possible.
What CVEs affect Firefox 139?
No CVEs are currently tracked for Firefox 139.x in our database. This may mean no vulnerabilities have been recorded yet, or the data is still syncing.
What is the latest Firefox 139 version?
The latest Firefox 139.x patch release is 139.0.4, released on June 10, 2025. Always run the latest patch to benefit from all security fixes.
How to migrate from Firefox 139 to Firefox 140?
To migrate from Firefox 139 to Firefox 140: (1) review the official Firefox 140 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 139 in production?
No. Firefox 139 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