An attacker could have caused a use-after-free by forcing a text reflow in an SVG object leading to a potentially exploitable crash. This vulnerability affects Firefox < 98, Firefox ESR < 91.7, and Thunderbird < 91.7.
https://www.mozilla.org/security/advisories/mfsa2022-12/
https://www.mozilla.org/security/advisories/mfsa2022-11/