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Join UsVersion 116.0beta, first offered to channel users on July 5, 2023
Thunderbird on Windows now requires Windows 10 or higher
Thunderbird on macOS now requires macOS 10.15 or higher
Updated message pane customization defaults for new profiles
All menu items in "Help" menu were disabled after sending a message on macOS
Pane splitter was still enabled for hidden folder pane
Folder tree expanded under drag-and-drop did not re-collapse when item was dropped
Deleting messages from message list sometimes scrolled list to bottom, selecting bottommost message
Ascending/descending message sorting was not available in vertical view
Message list was not updated when message was deleted from server outside of Thunderbird
Message header was occasionally missing in message preview
Message composer title was not visible on macOS when theme was enabled
Context menu with "Copy link" option was not available in calendar event descriptions
Improved localization of OpenPGP strings
"OK" and "Cancel" buttons were mostly hidden in address book Edit List dialog
Various visual and UX improvements
Added option to enable Menu Bar in Unified Toolbar context menu
Unified Toolbar could not be customized under certain tabs
Selecting a folder with one or more subfolders and pressing enter did not expand folder
LDAP addressbook did not work
Tooltips did not appear when hovering over folders
Message Summary header buttons were not keyboard accessible
"New" button in Message Filters dialog was not keyboard accessible
Various visual and UX improvements
Added Thunderbird Supernova branding to about:dialog
Thunderbird Flatpak could not be executed from terminal using command "thunderbird"
Old OpenPGP secret keys could not be used to decrypt messages under certain circumstances
Deleting large amounts of messages from Trash folder consumed excessive time and memory
When multiple folder modes were active, tab focus navigated through all folder mode options before reaching message list
Scrolling behaved unexpectedly when moving to next message unread message in another folder
Scrolling animation was unnecessarily used when switching or toggling the sort column in message list
Attempting to delete a message and then cancelling the action still marked the message as read
Various visual and UX improvements
Quick Filter bar is now hidden by default
Message-ID header used account domain instead of "From" field domain
Zooming did not work in multi-message view
"Clear Recent History" dialog did not resize correctly to fit content
Tooltip containing full message title did not appear when hovering over message in card view
Message List column headers became transparent in increased contrast mode
Message List card padding was incorrect in compact view
Mail tab toolbar and Unified toolbar heights adjusted to be more consistent
Messages in deeply nested IMAP folders were inaccessible
Total message counts and folder sizes were also hidden when "Hide Local Folders" was selected in Folder Pane options
Various visual and style fixes
CardDAV address book dialog did not resize properly to show all available address books