A cross-origin iframe referencing an XSLT document would inherit the parent domain's permissions (such as microphone or camera access). This vulnerability affects Thunderbird < 102.2, Thunderbird < 91.13, Firefox ESR < 91.13, Firefox ESR < 102.2, and Firefox < 104.
https://www.mozilla.org/security/advisories/mfsa2022-37/
https://www.mozilla.org/security/advisories/mfsa2022-36/
https://www.mozilla.org/security/advisories/mfsa2022-35/
https://www.mozilla.org/security/advisories/mfsa2022-34/