An invalid downcast from <code>nsTextNode</code> to <code>SVGElement</code> could have lead to undefined behavior. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.
https://www.mozilla.org/security/advisories/mfsa2023-07/
https://www.mozilla.org/security/advisories/mfsa2023-06/