Complete end-of-life dates, support windows, and security status for all Firefox versions. Data sourced from endoflife.date and official vendor documentation. Updated at every deploy.
| Version | Latest Release | Release Date | EOL Date | Days | Status |
|---|---|---|---|---|---|
| 78 LTS | 78.15.0 | Jun 30, 2020 | Nov 2, 2021 | 1649 days past EOL | EOL |
| 91 LTS | 91.13.0 | Aug 10, 2021 | Sep 20, 2022 | 1327 days past EOL | EOL |
| 102 LTS | 102.15.1 | Jun 28, 2022 | Sep 26, 2023 | 956 days past EOL | EOL |
| 103 | 103.0.2 | Jul 26, 2022 | Aug 23, 2022 | 1355 days past EOL | EOL |
| 104 | 104.0.2 | Aug 23, 2022 | Sep 20, 2022 | 1327 days past EOL | EOL |
| 105 | 105.0.3 | Sep 20, 2022 | Oct 18, 2022 | 1299 days past EOL | EOL |
| 106 | 106.0.5 | Oct 18, 2022 | Nov 15, 2022 | 1271 days past EOL | EOL |
| 107 | 107.0.1 | Nov 15, 2022 | Dec 13, 2022 | 1243 days past EOL | EOL |
| 108 | 108.0.2 | Dec 13, 2022 | Jan 17, 2023 | 1208 days past EOL | EOL |
| 109 | 109.0.1 | Jan 17, 2023 | Feb 14, 2023 | 1180 days past EOL | EOL |
| 110 | 110.0.1 | Feb 14, 2023 | Mar 14, 2023 | 1152 days past EOL | EOL |
| 111 | 111.0.1 | Mar 14, 2023 | Apr 11, 2023 | 1124 days past EOL | EOL |
| 112 | 112.0.2 | Apr 11, 2023 | May 9, 2023 | 1096 days past EOL | EOL |
| 113 | 113.0.2 | May 9, 2023 | Jun 6, 2023 | 1068 days past EOL | EOL |
| 114 | 114.0.2 | Jun 6, 2023 | Jul 4, 2023 | 1040 days past EOL | EOL |
| 115 LTS | 115.35.2 | Jul 4, 2023 | Aug 28, 2026 | 111 days remaining | Warning |
| 116 | 116.0.3 | Aug 1, 2023 | Aug 29, 2023 | 984 days past EOL | EOL |
| 117 | 117.0.1 | Aug 29, 2023 | Sep 26, 2023 | 956 days past EOL | EOL |
| 118 | 118.0.2 | Sep 26, 2023 | Oct 24, 2023 | 928 days past EOL | EOL |
| 119 | 119.0.1 | Oct 24, 2023 | Nov 21, 2023 | 900 days past EOL | EOL |
| 120 | 120.0.1 | Nov 21, 2023 | Dec 19, 2023 | 872 days past EOL | EOL |
| 121 | 121.0.1 | Dec 19, 2023 | Jan 23, 2024 | 837 days past EOL | EOL |
| 122 | 122.0.1 | Jan 23, 2024 | Feb 20, 2024 | 809 days past EOL | EOL |
| 123 | 123.0.1 | Feb 20, 2024 | Mar 19, 2024 | 781 days past EOL | EOL |
| 124 | 124.0.2 | Mar 19, 2024 | Apr 16, 2024 | 753 days past EOL | EOL |
| 125 | 125.0.3 | Apr 16, 2024 | May 14, 2024 | 725 days past EOL | EOL |
| 126 | 126.0.1 | May 14, 2024 | Jun 11, 2024 | 697 days past EOL | EOL |
| 127 | 127.0.2 | Jun 11, 2024 | Jul 9, 2024 | 669 days past EOL | EOL |
| 128 LTS | 128.14.0 | Jul 9, 2024 | Sep 16, 2025 | 235 days past EOL | EOL |
| 129 | 129.0.2 | Aug 6, 2024 | Sep 3, 2024 | 613 days past EOL | EOL |
| 130 | 130.0.1 | Sep 3, 2024 | Oct 1, 2024 | 585 days past EOL | EOL |
| 131 | 131.0.3 | Oct 1, 2024 | Oct 29, 2024 | 557 days past EOL | EOL |
| 132 | 132.0.2 | Oct 29, 2024 | Nov 26, 2024 | 529 days past EOL | EOL |
| 133 | 133.0.3 | Nov 26, 2024 | Jan 7, 2025 | 487 days past EOL | EOL |
| 134 | 134.0.2 | Jan 7, 2025 | Feb 4, 2025 | 459 days past EOL | EOL |
| 135 | 135.0.1 | Feb 4, 2025 | Mar 4, 2025 | 431 days past EOL | EOL |
| 136 | 136.0.4 | Mar 4, 2025 | Apr 1, 2025 | 403 days past EOL | EOL |
| 137 | 137.0.2 | Apr 1, 2025 | Apr 29, 2025 | 375 days past EOL | EOL |
| 138 | 138.0.4 | Apr 29, 2025 | May 27, 2025 | 347 days past EOL | EOL |
| 139 | 139.0.4 | May 27, 2025 | Jun 24, 2025 | 319 days past EOL | EOL |
| 140 LTS | 140.10.2 | Jun 24, 2025 | Sep 16, 2026 | 130 days remaining | Warning |
| 141 | 141.0.3 | Jul 22, 2025 | Aug 19, 2025 | 263 days past EOL | EOL |
| 142 | 142.0.1 | Aug 19, 2025 | Sep 16, 2025 | 235 days past EOL | EOL |
| 143 | 143.0.4 | Sep 16, 2025 | Oct 14, 2025 | 207 days past EOL | EOL |
| 144 | 144.0.2 | Oct 14, 2025 | Nov 11, 2025 | 179 days past EOL | EOL |
| 145 | 145.0.2 | Nov 11, 2025 | Dec 9, 2025 | 151 days past EOL | EOL |
| 146 | 146.0.1 | Dec 9, 2025 | Jan 13, 2026 | 116 days past EOL | EOL |
| 147 | 147.0.4 | Jan 13, 2026 | Feb 24, 2026 | 74 days past EOL | EOL |
| 148 | 148.0.2 | Feb 24, 2026 | Mar 24, 2026 | 46 days past EOL | EOL |
| 149 | 149.0.2 | Mar 24, 2026 | Apr 21, 2026 | 18 days past EOL | EOL |
| 150 | 150.0.2 | Apr 21, 2026 | Already EOL | Supported | Active |
When a Firefox version reaches end of life, the maintainers stop issuing security patches. Vulnerabilities discovered after this date are publicly disclosed on the National Vulnerability Database, exploit code appears on GitHub, and your systems remain permanently exposed.
The CVE blind spot: Most vulnerability scanners check for known CVEs but do not flag the accumulation of unpatched vulnerabilities in EOL software. With a zero-day, nobody knows about the vulnerability. With EOL software, the vulnerability is public — listed, rated, and often weaponized — but no patch will ever exist. This is the most dangerous gap in enterprise security posture.
Organizations running EOL Firefox should treat it as a vulnerability class in their risk register, apply compensating controls (network segmentation, enhanced monitoring, access restriction), and prioritize migration to a supported version.
Upload requirements.txt, package.json, or Gemfile — full EOL report instantly.
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