Mozilla Thunderbird is a standalone mail and newsgroup client. This update upgrades Thunderbird to version 78.10.0. Security Fix: * Mozilla: Out of bound write due to lazy initialization * Mozilla: Use-after-free in Responsive Design Mode * Mozilla: More internal network hosts could have been probed by a malicious webpage * Mozilla: Secure Lock icon could have been spoofed * Mozilla: Blob URLs may have been granted additional privileges * Mozilla: Arbitrary FTP command execution on FTP servers using an encoded URL * Mozilla: Incorrect size computation in WebAssembly JIT could lead to null-reads * Mozilla: Port blocking could be bypassed * Mozilla: Race condition when reading from disk while verifying signatures 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.