Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 78.13.0. Security Fix: * Mozilla: Uninitialized memory in a canvas object could have led to memory corruption * Mozilla: Incorrect instruction reordering during JIT optimization * Mozilla: Race condition when resolving DNS names could have led to memory corruption * Mozilla: Memory corruption as a result of incorrect style treatment * Mozilla: Memory safety bugs fixed in Thunderbird 78.13 * Mozilla: Use-after-free media channels 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.