# Firefox Developer Edition (en-US) 137.0

Firefox Developer Edition (en-US) 137.0, released March 12, 2025, fixes 8 CVEs in Firefox Developer Edition (en-US). None of them is reported as exploited. Patch Radar priority: Urgent. The latest Firefox Developer Edition (en-US) is 156.0, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/windows-app/mozilla.firefox.developeredition-137.0
- Platform: Windows apps
- Released: Mar 12, 2025
- Priority: Urgent (Closes CVE-2025-2857, rated Critical)
- CVEs: 8, exploited: 0, on CISA KEV: 0
- Superseded by: [Firefox Developer Edition (en-US) 156.0](https://patchblox.com/security/data/product/windows-app/firefox-developer-edition-en-us.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Firefox Developer Edition (en-US)](https://patchblox.com/security/data/product/windows-app/firefox-developer-edition-en-us.md) |  | 137.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-2857](https://patchblox.com/security/data/cve/CVE-2025-2857.md) | Urgent | Incorrect handle could lead to sandbox escapes | 10.0 | 0.0198 |  |
| [CVE-2025-3028](https://patchblox.com/security/data/cve/CVE-2025-3028.md) | High | Use-after-free triggered by XSLTProcessor | 8.8 | 0.0087 |  |
| [CVE-2025-3034](https://patchblox.com/security/data/cve/CVE-2025-3034.md) | High | Memory safety bugs fixed in Firefox 137 and Thunderbird 137 | 8.1 | 0.0048 |  |
| [CVE-2025-3032](https://patchblox.com/security/data/cve/CVE-2025-3032.md) | High | Leaking file descriptors from the fork server | 7.4 | 0.0040 |  |
| [CVE-2025-3029](https://patchblox.com/security/data/cve/CVE-2025-3029.md) | High | URL Bar Spoofing via non-BMP Unicode characters | 8.8 | 0.0036 |  |
| [CVE-2025-3033](https://patchblox.com/security/data/cve/CVE-2025-3033.md) | High | Opening local .url files could lead to another file being opened | 7.7 | 0.0017 |  |
| [CVE-2025-3031](https://patchblox.com/security/data/cve/CVE-2025-3031.md) | Routine | JIT optimization bug with different stack slot sizes | 6.5 | 0.0030 |  |
| [CVE-2025-3035](https://patchblox.com/security/data/cve/CVE-2025-3035.md) | Routine | Tab title disclosure across pages when using AI chatbot | 5.3 | 0.0030 |  |

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Data as of 2026-11-08T06:59:42Z 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

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