Firefox 129 End of Life Date
Firefox 129 end-of-life date, support status, and CVE risk. Data reconciled from official vendor documentation and endoflife.date at every build; the source of each date is on the product page.
Firefox 129 was released on August 6, 2024 and support ended on September 3, 2024 — a supported lifespan of 28 days, in line with the 28 days median for Firefox releases. It was not an LTS release; Firefox reserves longer patch windows for its LTS versions. The last patch it will ever receive is 129.0.2, published August 20, 2024 — 14 days before support ended. It has been without security patches for 2 years and 1 month. 26 newer Firefox releases have shipped since.
What does Firefox 129 end of life mean?
When Firefox 129 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: A CVE-based scan does not show the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Some scanners flag unsupported versions of common products, but coverage varies, and none of them give you the date in advance. Running Firefox 129 past its EOL date creates a growing attack surface that a clean scan result does not rule out.
Migrate to Firefox 156 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.