Documents in deeply-nested cross-origin browsing contexts could have obtained permissions granted to the top-level origin, bypassing the existing prompt and wrongfully inheriting the top-level permissions. This vulnerability affects Thunderbird < 91.9, Firefox ESR < 91.9, and Firefox < 100.
https://bugzilla.mozilla.org/show_bug.cgi?id=1755081
https://www.mozilla.org/security/advisories/mfsa2022-16/