- OpenPGP: Improved support for encrypting with subkeys
- OpenPGP message status icons were not visible in message header pane
- OpenPGP Key Manager was missing from Tools menu on macOS
- Creating a new calendar event did not require an event title
- Message list is not focused at startup
Thunderbird 78.3.3, a new version of the desktop email client, has been released. It addresses issues in the built-in OpenPGP encryption module and in calendar.