Firefox ESR end of life dates
Support dates for every Firefox Extended Support Release (ESR) branch, from Mozilla’s release calendar.
| Name | Status | Released | Security updates until | Extended support until |
|---|---|---|---|---|
| Firefox ESR 115 | Security fixes only | July 4, 2023 | March 2027 | |
| Firefox ESR 128 | End of life | July 9, 2024 | ||
| Firefox ESR 140 | End of life | June 24, 2025 | October 13, 2026 | |
| Firefox ESR 153 | Supported | July 21, 2026 |
Firefox ESR branches are the Firefox versions that organizations and older systems use for a year or more between major upgrades. The list covers ESR 115, 128, 140 and 153.
Questions
When does Firefox ESR 140 reach end of life? Firefox ESR 140 stops getting updates on October 13, 2026. After that, ESR 153 is the only main ESR branch.
Which Firefox ESR is current? Firefox ESR 153, released on July 21, 2026. Mozilla has not yet published the date its support ends.
Is Firefox ESR 128 still supported? No. Firefox ESR 128 has reached end of life; its last release, 128.15, shipped on September 16, 2025.
Why does Firefox ESR 115 still get updates? ESR 115 continues separately for Windows 7 to 8.1 and older macOS versions, with security fixes until March 2027.
Sources
Every date comes from the vendor’s official lifecycle or release page: Microsoft Lifecycle and Windows release health, Ubuntu’s release cycle, Debian releases, the Python developer guide, the Node.js release schedule, php.net, Oracle’s Java SE support roadmap and Lifetime Support Policy, the .NET support policy, PostgreSQL versioning, Mozilla’s release calendar and Google’s Pixel update policy. Each record links its sources and shows the date they were checked.