Firefox 140 ESR reaches end of life on September 29, 2026; Firefox 153 ESR (released July 21, 2026) is the replacement, and 115 ESR stays patched for…
Every Firefox ESR line: release and end-of-life dates
| ESR line | Released | End of Life | Status | EOL Risk Score™ |
|---|---|---|---|---|
| Firefox 153 ESR | Jul 21, 2026 | Current ESR — no end date announced | Supported | 40 |
| Firefox 140 ESR | Jun 24, 2025 | Sep 29, 2026 | Approaching | 55 |
| Firefox 128 ESR | Jul 9, 2024 | Sep 16, 2025 | EOL | 70 |
| Firefox 115 ESR | Jul 4, 2023 | Mar 31, 2027 | Approaching | 40 |
| Firefox 102 ESR | Jun 28, 2022 | Sep 26, 2023 | EOL | 80 |
| Firefox 91 ESR | Aug 10, 2021 | Sep 20, 2022 | EOL | 80 |
| Firefox 78 ESR | Jun 30, 2020 | Nov 2, 2021 | EOL | 80 |
What's covered
- Key Dates at a Glance
- Every Firefox ESR line: release and end-of-life dates
- Every Firefox ESR, one line each
- How the Firefox ESR cycle works
- The Firefox 115 ESR exception
- What to do when a Firefox ESR reaches end of life
- Support options when patches stop
Full guide with every version, risk scores, and live updates: https://endoflife.ai/article-firefox-esr-eol
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