Firefox 133.x — End of Life
EOLFirefox 133.x — All releases
| Version | Released | Active support | EOL date | Latest patch | Status |
|---|---|---|---|---|---|
| 133 | Nov 26, 2024 | — | Jan 7, 2025 | 133.0.3 | EOL |
CVEs affecting Firefox 133.x (0)
Firefox 133.x is EOL — migrate to Firefox 134.x
Firefox 134.x is the next major release. Plan your upgrade before Firefox 133.x stops receiving security patches.
Frequently asked questions
Is Firefox 133 end of life?
Yes. All Firefox 133.x releases have reached end of life and no longer receive security patches. Migrate to Firefox 134.x as soon as possible.
What CVEs affect Firefox 133?
No CVEs are currently tracked for Firefox 133.x in our database. This may mean no vulnerabilities have been recorded yet, or the data is still syncing.
What is the latest Firefox 133 version?
The latest Firefox 133.x patch release is 133.0.3, released on December 10, 2024. Always run the latest patch to benefit from all security fixes.
How to migrate from Firefox 133 to Firefox 134?
To migrate from Firefox 133 to Firefox 134: (1) review the official Firefox 134 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 133 in production?
No. Firefox 133 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