Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 78.4.0. Security Fix: * Mozilla: Memory safety bugs fixed in Firefox 82 and Firefox ESR 78.4 * chromium-browser: Use after free in WebRTC 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.