Firefox 115 End of Life

Support dates and upgrade guidance — rebuilt from live data.

Supported

Firefox 115 is actively supported. It reaches end of life on 31 Mar 2027.

234 days of security support left

115.38.0 latest release

83% of this branch's supported lifetime has elapsed — 4 Jul 2023 → 31 Mar 2027.

Check your versionfirefox --version

Support timeline

Official dates from the Firefox release process.

Firefox 115 is the newest branch — this is the longest runway currently available.

Branch	End of life	Days left	vs 115
Firefox 140	29 Sept 2026	51	-183 days
Firefox 115	31 Mar 2027	234	this branch

When does Firefox 115 reach end of life?

Firefox 115 reaches end of life on 31 Mar 2027 — 234 days from now. After that date it receives no security fixes.

Is Firefox 115 still supported?

Yes. Firefox 115 is currently maintained. Latest release: 115.38.0, published 21 Jul 2026.

What happens when Firefox 115 reaches end of life?

Security fixes stop. After 31 Mar 2027 this branch receives no further updates under standard support.

How long do I have to upgrade from Firefox 115?

234 days. This is already the newest branch, so this is the longest runway currently available.