When is Firefox 159 end of life?

Firefox 159 reaches end of life on Nov 10, 2026 (in 13 days). After that it gets no more updates, including security fixes.

What is the latest version of Firefox 159?

The latest Firefox 159 release is 159.0, released on Oct 27, 2026.

Firefox 159 was released on Oct 27, 2026.

Run firefox --version, then paste the result into the “Am I up to date?” box on this page.

Supported until Nov 10, 2026

159.0 Release notes ↗

Yes

Firefox 159 is supported until Nov 10, 2026 (in 13 days).

Supported Today What “supported” means

Is Firefox 159 still supported?: Yes. Firefox 159 is supported until Nov 10, 2026 (in 13 days).
When is Firefox 159 end of life?: Firefox 159 reaches end of life on Nov 10, 2026 (in 13 days). After that it gets no more updates, including security fixes.
What is the latest version of Firefox 159?: The latest Firefox 159 release is 159.0, released on Oct 27, 2026.
When was Firefox 159 released?: Firefox 159 was released on Oct 27, 2026.
How do I check which Firefox version I have?: Run firefox --version, then paste the result into the “Am I up to date?” box on this page.

The history fills in as new versions come out.

Badge for this branch (Markdown) Firefox end-of-life dates for your calendar