Firefox 140.x — End of Life
ActiveFirefox 140.x — All releases
| Version | Released | Active support | EOL date | Latest patch | Status |
|---|---|---|---|---|---|
| 140LTS | Jun 24, 2025 | — | Sep 16, 2026 | 140.11.0 | Active |
CVEs affecting Firefox 140.x (0)
Firefox 140.x will reach end of life — migrate to Firefox 141.x
Firefox 141.x is the next major release. Plan your upgrade before Firefox 140.x stops receiving security patches.
Frequently asked questions
Is Firefox 140 end of life?
No. Firefox 140.x is still supported until September 16, 2026. It continues to receive security patches and bug fixes.
What CVEs affect Firefox 140?
No CVEs are currently tracked for Firefox 140.x in our database. This may mean no vulnerabilities have been recorded yet, or the data is still syncing.
What is the latest Firefox 140 version?
The latest Firefox 140.x patch release is 140.11.0, released on May 19, 2026. Always run the latest patch to benefit from all security fixes.
How to migrate from Firefox 140 to Firefox 141?
To migrate from Firefox 140 to Firefox 141: (1) review the official Firefox 141 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 140 in production?
Firefox 140 is still supported and safe for production use until September 16, 2026. Ensure you are running the latest patch version (140.11.0) to have all security fixes applied.
Data sourced from endoflife.date · CVE data from NVD · EPSS from FIRST.org · KEV from CISA