Firefox 153 End of Life

Support dates and upgrade guidance — rebuilt from live data.

Supported

Firefox 153 is actively supported. The vendor has not published an end-of-support date for this branch.

153.4.0 latest release

Check your versionfirefox --version

Support timeline

Official dates from the Firefox release process.

Milestone	Date	Status
Initial release	21 Jul 2026	2mo ago
Latest release	153.4.0 · 29 Sept 2026	current

When does Firefox 153 reach end of life?

No end of life date has been announced for Firefox 153 yet.

Is Firefox 153 still supported?

Yes. Firefox 153 is currently maintained. Latest release: 153.4.0, published 29 Sept 2026.

What happens when Firefox 153 reaches end of life?

Security fixes stop. After — this branch receives no further updates under standard support.

How long do I have to upgrade from Firefox 153?

No end of life date has been announced yet.