Mozilla Firefox end-of-life: support & EOL dates for every release
Mozilla · Browser · 2 supported · 50 end-of-life · updated June 2026 · what is end-of-life? →
This is when each Mozilla Firefox release line stops receiving security updates. 2 release lines are still supported — the next to reach end-of-life is Mozilla Firefox 115 on 28 Aug 2026. Running an end-of-life version means new vulnerabilities stay unpatched.
Mozilla Firefox support timeline
Each release line and the date it reaches end-of-life — newest first.
| Release | Latest version | End-of-life | Status |
|---|---|---|---|
| Mozilla Firefox 140 | 140.12.0 | 16 Sept 2026 · in 3 mo | Ends soon |
| Mozilla Firefox 115 | 115.37.0 | 28 Aug 2026 · in 2 mo | Ends soon |
| Mozilla Firefox 151 | 151.0.4 | 16 Jun 2026 | End of life |
| Mozilla Firefox 150 | 150.0.3 | 18 May 2026 | End of life |
| Mozilla Firefox 149 | 149.0.2 | 21 Apr 2026 | End of life |
| Mozilla Firefox 148 | 148.0.2 | 24 Mar 2026 | End of life |
| Mozilla Firefox 147 | 147.0.4 | 24 Feb 2026 | End of life |
| Mozilla Firefox 146 | 146.0.1 | 13 Jan 2026 | End of life |
| Mozilla Firefox 145 | 145.0.2 | 9 Dec 2025 | End of life |
| Mozilla Firefox 144 | 144.0.2 | 11 Nov 2025 | End of life |
| Mozilla Firefox 143 | 143.0.4 | 14 Oct 2025 | End of life |
| Mozilla Firefox 142 | 142.0.1 | 16 Sept 2025 | End of life |
| Mozilla Firefox 128 | 128.14.0 | 16 Sept 2025 | End of life |
| Mozilla Firefox 141 | 141.0.3 | 19 Aug 2025 | End of life |
| Mozilla Firefox 139 | 139.0.4 | 24 Jun 2025 | End of life |
| Mozilla Firefox 138 | 138.0.4 | 27 May 2025 | End of life |
| Mozilla Firefox 137 | 137.0.2 | 29 Apr 2025 | End of life |
| Mozilla Firefox 136 | 136.0.4 | 1 Apr 2025 | End of life |
| Mozilla Firefox 135 | 135.0.1 | 4 Mar 2025 | End of life |
| Mozilla Firefox 134 | 134.0.2 | 4 Feb 2025 | End of life |
| Mozilla Firefox 133 | 133.0.3 | 7 Jan 2025 | End of life |
| Mozilla Firefox 132 | 132.0.2 | 26 Nov 2024 | End of life |
| Mozilla Firefox 131 | 131.0.3 | 29 Oct 2024 | End of life |
| Mozilla Firefox 130 | 130.0.1 | 1 Oct 2024 | End of life |
| Mozilla Firefox 129 | 129.0.2 | 3 Sept 2024 | End of life |
| Mozilla Firefox 127 | 127.0.2 | 9 Jul 2024 | End of life |
| Mozilla Firefox 126 | 126.0.1 | 11 Jun 2024 | End of life |
| Mozilla Firefox 125 | 125.0.3 | 14 May 2024 | End of life |
| Mozilla Firefox 124 | 124.0.2 | 16 Apr 2024 | End of life |
| Mozilla Firefox 123 | 123.0.1 | 19 Mar 2024 | End of life |
| Mozilla Firefox 122 | 122.0.1 | 20 Feb 2024 | End of life |
| Mozilla Firefox 121 | 121.0.1 | 23 Jan 2024 | End of life |
| Mozilla Firefox 120 | 120.0.1 | 19 Dec 2023 | End of life |
| Mozilla Firefox 119 | 119.0.1 | 21 Nov 2023 | End of life |
| Mozilla Firefox 118 | 118.0.2 | 24 Oct 2023 | End of life |
| Mozilla Firefox 117 | 117.0.1 | 26 Sept 2023 | End of life |
| Mozilla Firefox 102 | 102.15.1 | 26 Sept 2023 | End of life |
| Mozilla Firefox 116 | 116.0.3 | 29 Aug 2023 | End of life |
| Mozilla Firefox 114 | 114.0.2 | 4 Jul 2023 | End of life |
| Mozilla Firefox 113 | 113.0.2 | 6 Jun 2023 | End of life |
| Mozilla Firefox 112 | 112.0.2 | 9 May 2023 | End of life |
| Mozilla Firefox 111 | 111.0.1 | 11 Apr 2023 | End of life |
| Mozilla Firefox 110 | 110.0.1 | 14 Mar 2023 | End of life |
| Mozilla Firefox 109 | 109.0.1 | 14 Feb 2023 | End of life |
| Mozilla Firefox 108 | 108.0.2 | 17 Jan 2023 | End of life |
| Mozilla Firefox 107 | 107.0.1 | 13 Dec 2022 | End of life |
| Mozilla Firefox 106 | 106.0.5 | 15 Nov 2022 | End of life |
| Mozilla Firefox 105 | 105.0.3 | 18 Oct 2022 | End of life |
| Mozilla Firefox 104 | 104.0.2 | 20 Sept 2022 | End of life |
| Mozilla Firefox 91 | 91.13.0 | 20 Sept 2022 | End of life |
| Mozilla Firefox 103 | 103.0.2 | 23 Aug 2022 | End of life |
| Mozilla Firefox 78 | 78.15.0 | 2 Nov 2021 | End of life |
Which Mozilla Firefox version should I run?
The safest choice is the latest supported release, 152.0. If you're on an end-of-life line, plan an upgrade to a supported one before security updates stop. See Mozilla Firefox's full security status →
Get warned before Mozilla Firefox reaches end-of-life
End-of-life dates are easy to miss until it's too late. Monitor Mozilla Firefox on IsItPatched and we'll email you before the release line you run stops getting security updates — free, no account needed to start.
Mozilla Firefox end-of-life — frequently asked
What Mozilla Firefox versions are still supported?
As of June 2026, these Mozilla Firefox release lines still receive security updates: 140, 115. The latest supported release is 152.0. Versions older than these (151, 150, 149, 148, 147, 146, 145, 144, 143, 142, 128, 141, 139, 138, 137, 136, 135, 134, 133, 132, 131, 130, 129, 127, 126, 125, 124, 123, 122, 121, 120, 119, 118, 117, 102, 116, 114, 113, 112, 111, 110, 109, 108, 107, 106, 105, 104, 91, 103, 78) are end-of-life and no longer patched.
When does Mozilla Firefox 115 reach end of life?
Mozilla Firefox 115 reaches end-of-life on 28 Aug 2026 — about 2 months away. After that date it stops receiving security patches.
Is Mozilla Firefox end-of-life?
No — Mozilla Firefox still has supported release lines (140, 115). But individual older versions are end-of-life, so what matters is the specific version you run.
How do I know when my Mozilla Firefox version reaches end of life?
Check the version you run on its product page, or monitor Mozilla Firefox on IsItPatched to get an email alert before the release line you use reaches end-of-life — so you can upgrade in time.
EOL dates aggregated from endoflife.date and vendor sources, and can change — always confirm with Mozilla. See related: Mozilla Firefox security status · full EOL calendar · what is end-of-life software? · disclaimer.