Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 115.5.0. Security Fix(es): * Mozilla: Out-of-bound memory access in WebGL2 blitFramebuffer (CVE-2023-6204) * Mozilla: Use-after-free in MessagePort::Entangled (CVE-2023-6205) * Mozilla: Clickjacking permission prompts using the fullscreen transition (CVE-2023-6206) * Mozilla: Use-after-free in ReadableByteStreamQueueEntry::Buffer (CVE-2023-6207) * Mozilla: Memory safety bugs fixed in Firefox 120, Firefox ESR 115.5, and Thunderbird 115.5 (CVE-2023-6212) * Mozilla: Using Selection API would copy contents into X11 primary selection. (CVE-2023-6208) * Mozilla: Incorrect parsing of relative URLs starting with "///" (CVE-2023-6209) 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.