# Firefox Developer Edition (en-US) security updates

The latest version of Firefox Developer Edition (en-US) is 156.0, released September 2, 2026. Patch Radar has 26 security fixes for Firefox Developer Edition (en-US), closing 748 CVEs, 1 of which is being exploited. The newest security fix is Firefox Developer Edition (en-US) 156.0, released September 2, 2026. 76 CVEs have no fix yet.

- Web page: https://patchblox.com/security/product/windows-app/firefox-developer-edition-en-us
- Platform: Windows apps
- Vendor: Mozilla
- Latest version: 156.0 (Sep 2, 2026)
- Supported: yes

## CVEs with no fix yet

| CVE | Priority | Title | Status |
|---|---|---|---|
| [CVE-2026-100760](https://patchblox.com/security/data/cve/CVE-2026-100760.md) | Urgent | Sandbox escape in the Security: Process Sandboxing component | no-fix |
| [CVE-2026-100763](https://patchblox.com/security/data/cve/CVE-2026-100763.md) | Urgent | Incorrect boundary conditions in the Graphics: WebGPU component | no-fix |
| [CVE-2026-100787](https://patchblox.com/security/data/cve/CVE-2026-100787.md) | Urgent | Sandbox escape in the XUL component | no-fix |
| [CVE-2026-100800](https://patchblox.com/security/data/cve/CVE-2026-100800.md) | Urgent | Sandbox escape due to use-after-free in the Disability Access APIs component | no-fix |
| [CVE-2026-100804](https://patchblox.com/security/data/cve/CVE-2026-100804.md) | Urgent | Sandbox escape due to use-after-free in the Preferences: Backend component | no-fix |
| [CVE-2026-100810](https://patchblox.com/security/data/cve/CVE-2026-100810.md) | Urgent | Other issue in the DevTools component | no-fix |
| [CVE-2026-100828](https://patchblox.com/security/data/cve/CVE-2026-100828.md) | Urgent | Mitigation bypass in the Bookmarks & History component | no-fix |
| [CVE-2026-100829](https://patchblox.com/security/data/cve/CVE-2026-100829.md) | Urgent | Mitigation bypass in the DOM: Security component | no-fix |
| [CVE-2026-106016](https://patchblox.com/security/data/cve/CVE-2026-106016.md) | Urgent | Mitigation bypass in the File Handling component | no-fix |
| [CVE-2026-100756](https://patchblox.com/security/data/cve/CVE-2026-100756.md) | High | Incorrect boundary conditions in the Audio/Video: Playback component | no-fix |
| [CVE-2026-100757](https://patchblox.com/security/data/cve/CVE-2026-100757.md) | High | Use-after-free in the Widget component | no-fix |
| [CVE-2026-100758](https://patchblox.com/security/data/cve/CVE-2026-100758.md) | High | Sandbox escape in the DOM: Navigation component | no-fix |
| [CVE-2026-100759](https://patchblox.com/security/data/cve/CVE-2026-100759.md) | High | Uninitialized memory in the Storage: Quota Manager component | no-fix |
| [CVE-2026-100761](https://patchblox.com/security/data/cve/CVE-2026-100761.md) | High | Privilege escalation due to use-after-free in the Graphics: WebGPU component | no-fix |
| [CVE-2026-100762](https://patchblox.com/security/data/cve/CVE-2026-100762.md) | High | Sandbox escape due to use-after-free in the DOM: Content Processes component | no-fix |
| [CVE-2026-100764](https://patchblox.com/security/data/cve/CVE-2026-100764.md) | High | Privilege escalation due to incorrect boundary conditions in the Graphics: WebGPU component | no-fix |
| [CVE-2026-100765](https://patchblox.com/security/data/cve/CVE-2026-100765.md) | High | Use-after-free in the JavaScript: WebAssembly component | no-fix |
| [CVE-2026-100766](https://patchblox.com/security/data/cve/CVE-2026-100766.md) | High | Information disclosure in the Networking: JAR component | no-fix |
| [CVE-2026-100767](https://patchblox.com/security/data/cve/CVE-2026-100767.md) | High | Use-after-free in the Networking: Cache component | no-fix |
| [CVE-2026-100768](https://patchblox.com/security/data/cve/CVE-2026-100768.md) | High | Use-after-free in the Graphics: WebGPU component | no-fix |
| [CVE-2026-100769](https://patchblox.com/security/data/cve/CVE-2026-100769.md) | High | Use-after-free in the JavaScript: WebAssembly component | no-fix |
| [CVE-2026-100770](https://patchblox.com/security/data/cve/CVE-2026-100770.md) | High | Sandbox escape due to use-after-free in the DOM: Content Processes component | no-fix |
| [CVE-2026-100771](https://patchblox.com/security/data/cve/CVE-2026-100771.md) | High | Undefined behavior in the DOM: Streams component | no-fix |
| [CVE-2026-100772](https://patchblox.com/security/data/cve/CVE-2026-100772.md) | High | Use-after-free in the DOM: Core & HTML component | no-fix |
| [CVE-2026-100773](https://patchblox.com/security/data/cve/CVE-2026-100773.md) | High | Use-after-free in the Storage: IndexedDB component | no-fix |
| [CVE-2026-100774](https://patchblox.com/security/data/cve/CVE-2026-100774.md) | High | Use-after-free in the DOM: Core & HTML component | no-fix |
| [CVE-2026-100775](https://patchblox.com/security/data/cve/CVE-2026-100775.md) | High | Sandbox escape in the Graphics component | no-fix |
| [CVE-2026-100776](https://patchblox.com/security/data/cve/CVE-2026-100776.md) | High | Use-after-free in the JavaScript: WebAssembly component | no-fix |
| [CVE-2026-100777](https://patchblox.com/security/data/cve/CVE-2026-100777.md) | High | Use-after-free in the Graphics: Canvas2D component | no-fix |
| [CVE-2026-100778](https://patchblox.com/security/data/cve/CVE-2026-100778.md) | High | Sandbox escape due to use-after-free in the DOM: Core & HTML component | no-fix |
| [CVE-2026-100779](https://patchblox.com/security/data/cve/CVE-2026-100779.md) | High | Use-after-free in the XSLT component | no-fix |
| [CVE-2026-100780](https://patchblox.com/security/data/cve/CVE-2026-100780.md) | High | Use-after-free in the DOM: Core & HTML component | no-fix |
| [CVE-2026-100781](https://patchblox.com/security/data/cve/CVE-2026-100781.md) | High | Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component | no-fix |
| [CVE-2026-100782](https://patchblox.com/security/data/cve/CVE-2026-100782.md) | High | Privilege escalation due to incorrect boundary conditions in the Graphics component | no-fix |
| [CVE-2026-100783](https://patchblox.com/security/data/cve/CVE-2026-100783.md) | High | Uninitialized memory in the Audio/Video component | no-fix |
| [CVE-2026-100784](https://patchblox.com/security/data/cve/CVE-2026-100784.md) | High | Use-after-free in the Layout: Text and Fonts component | no-fix |
| [CVE-2026-100785](https://patchblox.com/security/data/cve/CVE-2026-100785.md) | High | Use-after-free in the DOM: Core & HTML component | no-fix |
| [CVE-2026-100786](https://patchblox.com/security/data/cve/CVE-2026-100786.md) | High | Sandbox escape due to use-after-free in the Graphics component | no-fix |
| [CVE-2026-100788](https://patchblox.com/security/data/cve/CVE-2026-100788.md) | High | Invalid pointer in the JavaScript: WebAssembly component | no-fix |
| [CVE-2026-100789](https://patchblox.com/security/data/cve/CVE-2026-100789.md) | High | Use-after-free in the Graphics: Canvas2D component | no-fix |
| [CVE-2026-100790](https://patchblox.com/security/data/cve/CVE-2026-100790.md) | High | Use-after-free in the XSLT component | no-fix |
| [CVE-2026-100791](https://patchblox.com/security/data/cve/CVE-2026-100791.md) | High | Use-after-free in the DOM: Core & HTML component | no-fix |
| [CVE-2026-100792](https://patchblox.com/security/data/cve/CVE-2026-100792.md) | High | JIT miscompilation in the JavaScript: WebAssembly component | no-fix |
| [CVE-2026-100794](https://patchblox.com/security/data/cve/CVE-2026-100794.md) | High | Sandbox escape due to incorrect boundary conditions in the Internationalization component | no-fix |
| [CVE-2026-100796](https://patchblox.com/security/data/cve/CVE-2026-100796.md) | High | Use-after-free in the JavaScript: WebAssembly component | no-fix |
| [CVE-2026-100797](https://patchblox.com/security/data/cve/CVE-2026-100797.md) | High | Privilege escalation due to use-after-free in the Graphics: WebRender component | no-fix |
| [CVE-2026-100798](https://patchblox.com/security/data/cve/CVE-2026-100798.md) | High | Cryptography misuse in Storage: Quota Manager component | no-fix |
| [CVE-2026-100801](https://patchblox.com/security/data/cve/CVE-2026-100801.md) | High | Privilege escalation in the DLL Services component | no-fix |
| [CVE-2026-100803](https://patchblox.com/security/data/cve/CVE-2026-100803.md) | High | Same-origin policy bypass in the WebExtensions component | no-fix |
| [CVE-2026-100805](https://patchblox.com/security/data/cve/CVE-2026-100805.md) | High | Race condition, use-after-free in the Audio/Video component | no-fix |
| [CVE-2026-100807](https://patchblox.com/security/data/cve/CVE-2026-100807.md) | High | Privilege escalation in the DOM: Service Workers component | no-fix |
| [CVE-2026-100808](https://patchblox.com/security/data/cve/CVE-2026-100808.md) | High | Mitigation bypass in the DOM: Service Workers component | no-fix |
| [CVE-2026-100809](https://patchblox.com/security/data/cve/CVE-2026-100809.md) | High | Same-origin policy bypass in the DevTools component | no-fix |
| [CVE-2026-100811](https://patchblox.com/security/data/cve/CVE-2026-100811.md) | High | Sandbox escape due to use-after-free in the DOM: Core & HTML component | no-fix |
| [CVE-2026-100813](https://patchblox.com/security/data/cve/CVE-2026-100813.md) | High | Invalid pointer in the JavaScript Engine: JIT component | no-fix |
| [CVE-2026-100814](https://patchblox.com/security/data/cve/CVE-2026-100814.md) | High | Incorrect boundary conditions in the JavaScript Engine: JIT component | no-fix |
| [CVE-2026-100815](https://patchblox.com/security/data/cve/CVE-2026-100815.md) | High | Use-after-free in the CSS Parsing and Computation component | no-fix |
| [CVE-2026-100816](https://patchblox.com/security/data/cve/CVE-2026-100816.md) | High | Site isolation issue in the DOM: Networking component | no-fix |
| [CVE-2026-100818](https://patchblox.com/security/data/cve/CVE-2026-100818.md) | High | Sandbox escape due to use-after-free in the Widget: Gtk component | no-fix |
| [CVE-2026-100819](https://patchblox.com/security/data/cve/CVE-2026-100819.md) | High | Sandbox escape due to incorrect boundary conditions in the XPCOM component | no-fix |
| [CVE-2026-100820](https://patchblox.com/security/data/cve/CVE-2026-100820.md) | High | Privilege escalation in the Address Bar component | no-fix |
| [CVE-2026-100821](https://patchblox.com/security/data/cve/CVE-2026-100821.md) | High | Site isolation issue in the Panning and Zooming component | no-fix |
| [CVE-2026-100824](https://patchblox.com/security/data/cve/CVE-2026-100824.md) | High | Privilege escalation in the Places component | no-fix |
| [CVE-2026-100825](https://patchblox.com/security/data/cve/CVE-2026-100825.md) | High | Use-after-free in the JavaScript Engine: JIT component | no-fix |
| [CVE-2026-100830](https://patchblox.com/security/data/cve/CVE-2026-100830.md) | High | Mitigation bypass in the DOM: Navigation component | no-fix |
| [CVE-2026-100831](https://patchblox.com/security/data/cve/CVE-2026-100831.md) | High | Use-after-free in the DOM: UI Events & Focus Handling component | no-fix |
| [CVE-2026-96869](https://patchblox.com/security/data/cve/CVE-2026-96869.md) | High | Information disclosure in the Networking component | no-fix |
| [CVE-2026-100793](https://patchblox.com/security/data/cve/CVE-2026-100793.md) | Routine | JIT miscompilation in the JavaScript Engine component | no-fix |
| [CVE-2026-100795](https://patchblox.com/security/data/cve/CVE-2026-100795.md) | Routine | Denial-of-service in the Networking component | no-fix |
| [CVE-2026-100799](https://patchblox.com/security/data/cve/CVE-2026-100799.md) | Routine | Uninitialized memory in the Graphics: WebGPU component | no-fix |
| [CVE-2026-100802](https://patchblox.com/security/data/cve/CVE-2026-100802.md) | Routine | Uninitialized memory in the Graphics: WebGPU component | no-fix |
| [CVE-2026-100806](https://patchblox.com/security/data/cve/CVE-2026-100806.md) | Routine | Uninitialized memory in the Graphics: WebGPU component | no-fix |
| [CVE-2026-100812](https://patchblox.com/security/data/cve/CVE-2026-100812.md) | Routine | Denial-of-service in the Graphics component | no-fix |
| [CVE-2026-100817](https://patchblox.com/security/data/cve/CVE-2026-100817.md) | Routine | Other issue in the JavaScript: WebAssembly component | no-fix |
| [CVE-2026-100822](https://patchblox.com/security/data/cve/CVE-2026-100822.md) | Routine | Spoofing issue in the Networking: HTTP component | no-fix |
| [CVE-2026-100826](https://patchblox.com/security/data/cve/CVE-2026-100826.md) | Routine | Denial-of-service in the Storage: StorageManager component | no-fix |

## Security fixes, newest first

| Fix | Released | Fixed in | Priority | CVEs | Exploited |
|---|---|---|---|---:|---:|
| [Firefox Developer Edition (en-US) 156.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-156.0.md) | Sep 2, 2026 | 156.0 | Urgent | 259 | 0 |
| [Firefox Developer Edition (en-US) 151.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-151.0.md) | May 13, 2026 | 151.0 | Urgent | 88 | 0 |
| [Firefox Developer Edition (en-US) 149.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-149.0.md) | Mar 13, 2026 | 149.0 | Urgent | 47 | 0 |
| [Firefox Developer Edition (en-US) 148.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-148.0.md) | Feb 9, 2026 | 148.0 | Urgent | 54 | 0 |
| [Firefox Developer Edition (en-US) 147.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-147.0.md) | Dec 22, 2025 | 147.0 | Urgent | 18 | 0 |
| [Firefox Developer Edition (en-US) 146.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-146.0.md) | Nov 28, 2025 | 146.0 | Urgent | 13 | 0 |
| [Firefox Developer Edition (en-US) 145.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-145.0.md) | Oct 31, 2025 | 145.0 | Urgent | 17 | 0 |
| [Firefox Developer Edition (en-US) 144.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-144.0.md) | Oct 3, 2025 | 144.0 | Urgent | 13 | 0 |
| [Firefox Developer Edition (en-US) 143.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-143.0.md) | Sep 5, 2025 | 143.0 | High | 10 | 0 |
| [Firefox Developer Edition (en-US) 142.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-142.0.md) | Aug 8, 2025 | 142.0 | Urgent | 9 | 0 |
| [Firefox Developer Edition (en-US) 141.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-141.0.md) | Jul 11, 2025 | 141.0 | Urgent | 24 | 0 |
| [Firefox Developer Edition (en-US) 140.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-140.0.md) | Jun 13, 2025 | 140.0 | Urgent | 12 | 0 |
| [Firefox Developer Edition (en-US) 139.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-139.0.md) | May 18, 2025 | 139.0 | High | 11 | 0 |
| [Firefox Developer Edition (en-US) 138.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-138.0.md) | Apr 18, 2025 | 138.0 | High | 12 | 0 |
| [Firefox Developer Edition (en-US) 137.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-137.0.md) | Mar 12, 2025 | 137.0 | Urgent | 8 | 0 |
| [Firefox Developer Edition (en-US) 136.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-136.0.md) | Feb 21, 2025 | 136.0 | Urgent | 14 | 0 |
| [Firefox Developer Edition (en-US) 135.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-135.0.md) | Jan 24, 2025 | 135.0 | High | 13 | 0 |
| [Firefox Developer Edition (en-US) 134.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-134.0.md) | Dec 13, 2024 | 134.0 | High | 9 | 0 |
| [Firefox Developer Edition (en-US) 133.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-133.0.md) | Nov 15, 2024 | 133.0 | Urgent | 16 | 0 |
| [Firefox Developer Edition (en-US) 132.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-132.0.md) | Oct 18, 2024 | 132.0 | Patch now | 14 | 1 |
| [Firefox Developer Edition (en-US) 131.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-131.0.md) | Sep 3, 2024 | 131.0 | High | 13 | 0 |
| [Firefox Developer Edition (en-US) 130.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-130.0.md) | Aug 6, 2024 | 130.0 | High | 8 | 0 |
| [Firefox Developer Edition (en-US) 129.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-129.0.md) | Jul 9, 2024 | 129.0 | High | 18 | 0 |
| [Firefox Developer Edition (en-US) 128.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-128.0.md) | Jun 11, 2024 | 128.0 | Urgent | 16 | 0 |
| [Firefox Developer Edition (en-US) 127.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-127.0.md) | May 14, 2024 | 127.0 | High | 15 | 0 |
| [Firefox Developer Edition (en-US) 126.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.developeredition-126.0.md) | Apr 16, 2024 | 126.0 | High | 17 | 0 |

---

Data as of 2026-11-11T01:43:54Z 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

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