# Mozilla Firefox (eo) security updates The latest version of Mozilla Firefox (eo) is 159.0, released October 27, 2026. Patch Radar has 37 security fixes for Mozilla Firefox (eo), closing 663 CVEs. The newest security fix is Mozilla Firefox (eo) 157.0.1, released October 6, 2026. Version 159.0 adds no new CVE fixes and includes all of them. - Web page: https://patchblox.com/security/product/windows-app/mozilla-firefox-eo - Platform: Windows apps - Vendor: Mozilla - Latest version: 159.0 (Oct 27, 2026) - Supported: yes ## Security fixes, newest first | Fix | Released | Fixed in | Priority | CVEs | Exploited | |---|---|---|---|---:|---:| | Mozilla Firefox (eo) 159.0 (latest, includes every fix below) | Oct 27, 2026 | 159.0 | | | | | [Mozilla Firefox (eo) 157.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-157.0.1.md) | Oct 6, 2026 | 157.0.1 | Urgent | 1 | 0 | | [Mozilla Firefox (eo) 157.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-157.0.md) | Sep 29, 2026 | 157.0 | Urgent | 75 | 0 | | [Mozilla Firefox (eo) 156.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-156.0.md) | Sep 15, 2026 | 156.0 | Urgent | 72 | 0 | | [Mozilla Firefox (eo) 155.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-155.0.md) | Sep 1, 2026 | 155.0 | Urgent | 26 | 0 | | [Mozilla Firefox (eo) 154.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-154.0.md) | Aug 18, 2026 | 154.0 | Urgent | 56 | 0 | | [Mozilla Firefox (eo) 153.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-153.0.md) | Jul 21, 2026 | 153.0 | Urgent | 61 | 0 | | [Mozilla Firefox (eo) 152.0.6](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-152.0.6.md) | Jul 14, 2026 | 152.0.6 | High | 2 | 0 | | [Mozilla Firefox (eo) 152.0.4](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-152.0.4.md) | Jun 30, 2026 | 152.0.4 | Urgent | 1 | 0 | | [Mozilla Firefox (eo) 152.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-152.0.md) | Jun 16, 2026 | 152.0 | Urgent | 40 | 0 | | [Mozilla Firefox (eo) 151.0.3](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-151.0.3.md) | Jun 2, 2026 | 151.0.3 | High | 2 | 0 | | [Mozilla Firefox (eo) 151.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-151.0.md) | May 19, 2026 | 151.0 | Urgent | 31 | 0 | | [Mozilla Firefox (eo) 150.0.3](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-150.0.3.md) | May 12, 2026 | 150.0.3 | High | 5 | 0 | | [Mozilla Firefox (eo) 150.0.2](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-150.0.2.md) | May 7, 2026 | 150.0.2 | High | 3 | 0 | | [Mozilla Firefox (eo) 150.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-150.0.1.md) | Apr 28, 2026 | 150.0.1 | High | 4 | 0 | | [Mozilla Firefox (eo) 150.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-150.0.md) | Apr 21, 2026 | 150.0 | Urgent | 42 | 0 | | [Mozilla Firefox (eo) 149.0.2](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-149.0.2.md) | Apr 7, 2026 | 149.0.2 | Urgent | 4 | 0 | | [Mozilla Firefox (eo) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-149.0.md) | Mar 24, 2026 | 149.0 | Urgent | 45 | 0 | | [Mozilla Firefox (eo) 148.0.2](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-148.0.2.md) | Mar 10, 2026 | 148.0.2 | High | 2 | 0 | | [Mozilla Firefox (eo) 148.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-148.0.md) | Feb 24, 2026 | 148.0 | Urgent | 51 | 0 | | [Mozilla Firefox (eo) 147.0.4](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-147.0.4.md) | Feb 16, 2026 | 147.0.4 | High | 1 | 0 | | [Mozilla Firefox (eo) 147.0.2](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-147.0.2.md) | Jan 27, 2026 | 147.0.2 | High | 2 | 0 | | [Mozilla Firefox (eo) 147.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-147.0.md) | Jan 13, 2026 | 147.0 | Urgent | 16 | 0 | | [Mozilla Firefox (eo) 146.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-146.0.1.md) | Dec 18, 2025 | 146.0.1 | Urgent | 2 | 0 | | [Mozilla Firefox (eo) 146.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-146.0.md) | Dec 9, 2025 | 146.0 | Urgent | 13 | 0 | | [Mozilla Firefox (eo) 145.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-145.0.md) | Nov 11, 2025 | 145.0 | Urgent | 16 | 0 | | [Mozilla Firefox (eo) 144.0.2](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-144.0.2.md) | Oct 28, 2025 | 144.0.2 | Urgent | 1 | 0 | | [Mozilla Firefox (eo) 144.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-144.0.md) | Oct 14, 2025 | 144.0 | Urgent | 10 | 0 | | [Mozilla Firefox (eo) 143.0.3](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-143.0.3.md) | Sep 30, 2025 | 143.0.3 | High | 2 | 0 | | [Mozilla Firefox (eo) 143.0.1](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-143.0.1.md) | Sep 19, 2025 | 143.0.1 | High | 1 | 0 | | [Mozilla Firefox (eo) 143.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-143.0.md) | Sep 16, 2025 | 143.0 | High | 10 | 0 | | [Mozilla Firefox (eo) 142.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-142.0.md) | Aug 19, 2025 | 142.0 | Urgent | 9 | 0 | | [Mozilla Firefox (eo) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-141.0.md) | Jul 22, 2025 | 141.0 | Urgent | 23 | 0 | | [Mozilla Firefox (eo) 140.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-140.0.md) | Jun 24, 2025 | 140.0 | High | 10 | 0 | | [Mozilla Firefox (eo) 139.0.4](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-139.0.4.md) | Jun 10, 2025 | 139.0.4 | Urgent | 2 | 0 | | [Mozilla Firefox (eo) 139.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-139.0.md) | May 27, 2025 | 139.0 | High | 9 | 0 | | [Mozilla Firefox (eo) 138.0.4](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-138.0.4.md) | May 17, 2025 | 138.0.4 | High | 2 | 0 | | [Mozilla Firefox (eo) 138.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.eo-138.0.md) | Apr 29, 2025 | 138.0 | High | 11 | 0 | --- Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.