Log Message:
thunderbird: Update to 78.5.1

Changelog:
What's New
OpenPGP: Added option to disable email subject encryption

Changes
OpenPGP public key import now supports multi-file selection and bulk accepting \ 
imported keys
MailExtensions: getComposeDetails will wait for "compose-editor-ready" \ 
event

Fixes
New mail icon was not removed from the system tray at shutdown
"Place replies in the folder of the message being replied to" did not \ 
work when using "Reply to List"
Thunderbird did not honor the "Run search on server" option when \ 
searching messages
Highlight color for folders with unread messages wasn't visible in dark theme
OpenPGP: Key were missing from Key Manager
OpenPGP: Option to import keys from clipboard always disabled
The "Link" button on the large attachments info bar failed to open up \ 
Filelink section in Options if the user had not yet configured Filelink
Address book: Printing members of a mailing list resulted in incorrect output
Unable to connect to LDAP servers configured with a self-signed SSL certificate
Autoconfig via LDAP did not work as expected
Calendar: Pressing Ctrl-Enter in the new event dialog would create duplicate events
Various security fixes

Security fixes:
#CVE-2020-26970: Stack overflow due to incorrect parsing of SMTP server response \ 
codes