On arm64, WASM code could have resulted in incorrect assembly generation leading to a register allocation problem, and a potentially exploitable crash. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.
https://www.mozilla.org/security/advisories/mfsa2022-22/
https://www.mozilla.org/security/advisories/mfsa2022-21/