CVE-2025-6435 — If a user saved a response from the Network tab in Devtools using the Save As context menu option, that…

Description

If a user saved a response from the Network tab in Devtools using the Save As context menu option, that file may not have been saved with the `.download` file extension. This could have led to the user inadvertently running a malicious executable. This vulnerability was fixed in Firefox 140 and Thunderbird 140.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1950056
• https://bugzilla.mozilla.org/show_bug.cgi?id=1961777
• https://www.mozilla.org/security/advisories/mfsa2025-51/
• https://www.mozilla.org/security/advisories/mfsa2025-54/