Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 91.9.0. Security Fix(es): * Mozilla: Bypassing permission prompt in nested browsing contexts (CVE-2022-29909) * Mozilla: iframe Sandbox bypass (CVE-2022-29911) * Mozilla: Fullscreen notification bypass using popups (CVE-2022-29914) * Mozilla: Leaking browser history with CSS variables (CVE-2022-29916) * Mozilla: Memory safety bugs fixed in Firefox 100 and Firefox ESR 91.9 (CVE-2022-29917) * Mozilla: Reader mode bypassed SameSite cookies (CVE-2022-29912) * Mozilla: Speech Synthesis feature not properly disabled (CVE-2022-29913) * Mozilla: Incorrect security status shown after viewing an attached email (CVE-2022-1520) 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.