Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 147 and Firefox ESR < 140.7.CreditsGary Kwong and Nan WangReferenceshttps://bugzilla.mozilla.org/show_bug.cgi?id=2003588https://www.mozilla.org/security/advisories/mfsa2026-01/https://www.mozilla.org/security/advisories/mfsa2026-03/