Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 91.9.1. Security Fix(es): * Mozilla: Untrusted input used in JavaScript object indexing, leading to prototype pollution (CVE-2022-1529) * Mozilla: Prototype pollution in Top-Level Await implementation (CVE-2022-1802) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.