Log Message:
thunderbird: Update t o 78.10.0

Changelog:
Fixes:
Usability & theme improvements on Windows
Various security fixes

Security fixes:
#CVE-2021-23994: Out of bound write due to lazy initialization
#CVE-2021-23995: Use-after-free in Responsive Design Mode
#CVE-2021-23998: Secure Lock icon could have been spoofed
#CVE-2021-23961: More internal network hosts could have been probed by a
 malicious webpage
#CVE-2021-23999: Blob URLs may have been granted additional privileges
#CVE-2021-24002: Arbitrary FTP command execution on FTP servers using an
 encoded URL
#CVE-2021-29945: Incorrect size computation in WebAssembly JIT could lead to
 null-reads
#CVE-2021-29948: Race condition when reading from disk while verifying
 signatures