Firefox 109 End of Life

Support dates and upgrade guidance — rebuilt from live data.

End of Life

Firefox 109 reached end of life on 14 Feb 2023. It no longer receives security fixes.

1,272 days without security patches

Recommended action: upgrade to Firefox 153.

Check your versionfirefox --version

Support timeline

Official dates from the Firefox release process.

Milestone	Date	Status
Initial release	17 Jan 2023	—
End of life	14 Feb 2023	3.5 years ago
Latest release	109.0.1 · 31 Jan 2023	final

Where to go from 109

Recommended target: Firefox 153.

The newest actively supported branch is Firefox 153 (latest release 153.0.3).

Frequently asked questions

Is Firefox 109 still safe to use?

Firefox 109 reached end of life on 14 Feb 2023, 1,272 days ago, and is no longer covered by standard support. Running it means no guaranteed security fixes.

Can I still download Firefox 109?

Yes — the final release (109.0.1) generally remains available from vendor archives and OS package mirrors, but installing it means running software with known, unpatched vulnerabilities.

What should I upgrade Firefox 109 to?

Upgrade to Firefox 153, the newest actively supported branch.

Firefox 109 End of Life

Support timeline

Where to go from 109

Frequently asked questions

All Firefox versions