Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 91.4.0. Security Fix: * Mozilla: Memory safety bugs fixed in Firefox 95 and Firefox ESR 91.4 * Mozilla: URL leakage when navigating while executing asynchronous function * Mozilla: Heap buffer overflow when using structured clone * Mozilla: Missing fullscreen and pointer lock notification when requesting both * Mozilla: GC rooting failure when calling wasm instance methods * Mozilla: External protocol handler parameters were unescaped * Mozilla: XMLHttpRequest error codes could have leaked the existence of an external protocol handler * Mozilla: Bypass of CSP sandbox directive when embedding * Mozilla: JavaScript unexpectedly enabled for the composition area * Mozilla: Denial of Service when using the Location API in a loop * Mozilla: Cursor spoofing could overlay user interface when native cursor is zoomed 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.