When opening appref-ms files, Firefox did not warn the user that these files may contain malicious code. *This bug only affects Firefox on Windows. Other operating systems are unaffected.* This vulnerability affects Firefox < 116, Firefox ESR < 102.14, Firefox ESR < 115.1, Thunderbird < 102.14, and Thunderbird < 115.1.
https://www.mozilla.org/security/advisories/mfsa2023-33/
https://www.mozilla.org/security/advisories/mfsa2023-32/
https://www.mozilla.org/security/advisories/mfsa2023-31/
https://www.mozilla.org/security/advisories/mfsa2023-30/