Certain types of allocations were missing annotations that, if the Garbage Collector was in a specific state, could have lead to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 102.4, Firefox ESR < 102.4, and Firefox < 106.
https://bugzilla.mozilla.org/show_bug.cgi?id=1791520
https://www.mozilla.org/security/advisories/mfsa2022-46/