Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 68.4.1. Security Fix: * Mozilla: IonMonkey type confusion with StoreElementHole and FallibleStoreElement * Mozilla: Bypass of @namespace CSS sanitization during pasting * Mozilla: Type Confusion in XPCVariant.cpp * Mozilla: Memory safety bugs fixed in Firefox 72 and Firefox ESR 68.4 * Mozilla: CSS sanitization does not escape HTML tags For more details about the security issue, including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page listed in the References section.