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 Firefox < 106, Firefox ESR < 102.4, and Thunderbird < 102.4.
https://www.mozilla.org/security/advisories/mfsa2022-46/
https://www.mozilla.org/security/advisories/mfsa2022-45/