Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 78.9.0. Security Fix: * Mozilla: Texture upload into an unbound backing buffer resulted in an out-of-bound read * Mozilla: Memory safety bugs fixed in Firefox 87 and Firefox ESR 78.9 * Mozilla: Internal network hosts could have been probed by a malicious webpage * Mozilla: Malicious extensions could have spoofed popup information 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.