Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 91.9.1. Security Fix: * Mozilla: Untrusted input used in JavaScript object indexing, leading to prototype pollution * Mozilla: Prototype pollution in Top-Level Await implementation 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.