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Join UsVersion 91.3.0, first offered to channel users on November 3, 2021
Default mail headers were set incorrectly when the value contained a colon (:)
Thunderbird did not send the QUIT command when closing an SMTP connection
Mail tabs could not be closed using the context menu
"Print" context menu was still shown when no message pane was displayed
Windows tray icon did not reappear after restarting Windows Explorer
Compose window attachment drag and drop fixes
Various macOS stability improvements
Drag and Drop area for file attachments on Windows was incorrect
CardDAV address books without a name did not work
Thunderbird tried to refresh disabled and manual-only calendars when the network state changed from offline to online
Various Calendar event dialog fixes
Various security fixes