Concurrent use of the URL parser with non-UTF-8 data was not thread-safe. This could lead to a use-after-free causing a potentially exploitable crash. This vulnerability affects Firefox ESR < 102.3, Thunderbird < 102.3, and Firefox < 105.
https://bugzilla.mozilla.org/show_bug.cgi?id=1787633
https://www.mozilla.org/security/advisories/mfsa2022-40/