When handling keypress events, an attacker may have been able to trick a user into bypassing the "Open Executable File?" confirmation dialog. This could have led to malicious code execution. This vulnerability affects Firefox < 133, Firefox ESR < 128.5, Thunderbird < 133, and Thunderbird < 128.5.
https://www.mozilla.org/security/advisories/mfsa2024-68/
https://www.mozilla.org/security/advisories/mfsa2024-67/
https://www.mozilla.org/security/advisories/mfsa2024-64/