CVE-2025-6426 — The executable file warning did not warn users before opening files with the `terminal` extension.

Description

The executable file warning did not warn users before opening files with the `terminal` extension. *This bug only affects Firefox for macOS. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1964385
• https://www.mozilla.org/security/advisories/mfsa2025-51/
• https://www.mozilla.org/security/advisories/mfsa2025-53/
• https://www.mozilla.org/security/advisories/mfsa2025-54/
• https://www.mozilla.org/security/advisories/mfsa2025-55/