CVE ID:	CVE-2021-23960
Description:	Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2021-23960 https://bugzilla.mozilla.org/show_bug.cgi?id=1675755 https://bugzilla.mozilla.org/show_bug.cgi?id=1675755 https://www.mozilla.org/security/advisories/mfsa2021-03/ https://www.mozilla.org/security/advisories/mfsa2021-03/ https://www.mozilla.org/security/advisories/mfsa2021-04/ https://www.mozilla.org/security/advisories/mfsa2021-04/ https://www.mozilla.org/security/advisories/mfsa2021-05/ https://www.mozilla.org/security/advisories/mfsa2021-05/