Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 78.7.0. Security Fix: * Mozilla: Cross-origin information leakage via redirected PDF requests * Mozilla: Type confusion when using logical assignment operators in JavaScript switch statements * Mozilla: Memory safety bugs fixed in Firefox 85 and Firefox ESR 78.7 * Mozilla: IMAP Response Injection when using STARTTLS * Mozilla: HTTPS pages could have been intercepted by a registered service worker when they should not have been * Mozilla: Use-after-poison for incorrectly redeclared JavaScript variables during GC 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.