Firefox 143.x — End of Life
EOLFirefox 143.x — All releases
| Version | Released | Active support | EOL date | Latest patch | Status |
|---|---|---|---|---|---|
| 143 | Sep 16, 2025 | — | Oct 14, 2025 | 143.0.4 | EOL |
CVEs affecting Firefox 143.x (0)
Firefox 143.x is EOL — migrate to Firefox 144.x
Firefox 144.x is the next major release. Plan your upgrade before Firefox 143.x stops receiving security patches.
Frequently asked questions
Is Firefox 143 end of life?
Yes. All Firefox 143.x releases have reached end of life and no longer receive security patches. Migrate to Firefox 144.x as soon as possible.
What CVEs affect Firefox 143?
No CVEs are currently tracked for Firefox 143.x in our database. This may mean no vulnerabilities have been recorded yet, or the data is still syncing.
What is the latest Firefox 143 version?
The latest Firefox 143.x patch release is 143.0.4, released on October 3, 2025. Always run the latest patch to benefit from all security fixes.
How to migrate from Firefox 143 to Firefox 144?
To migrate from Firefox 143 to Firefox 144: (1) review the official Firefox 144 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 143 in production?
No. Firefox 143 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