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Join UsVersion 115.0beta, first offered to channel users on June 8, 2023
User-defined OpenPGP passphrases now supported
Option to show Tags in Folder Pane added to Folder Pane meatball menu
"Move To" and "Copy To" actions added to Folder context menu
Quick Filter buttons are now more easily accessible via keyboard navigation
Added new icon for display options
OpenPGP messages now default to using combined signing and encryption
Updated icons for "Calendar", "Tasks New", and "Edit" tabs
Removing items from Unified Toolbar by dragged outside of toolbar during customization now behaves more intuitively
Double-clicking on draft messages in global search did not open compose window
Incorrect context menu was displayed when right-clicking on column headers in Message List
Right-clicking on unselected messages in Message List did not work
Selected text from unrelated message was quoted when replying to another message via context menu
Message Reader sometimes did not correctly reflect selected/deselected messages when using "Grouped by sort"
Unicode character set information was not included in message header when composing message via "Forward" or "Edit as new message"
Embedded images now include filename and extension in header if none is included
"Move To" button on Unified Toolbar moved both selected message and message adjacent to selected message to chosen folder
Drag-and-drop did not work for attachments when dropping into macOS Finder
Context menu could not be opened in OpenPGP key manager using keyboard
User's public encryption key was not sent in autocrypt header under certain circumstances
"Passphrase" tab of Key Manager was incorrectly shown for public keys
IMAP messages marked as deleted showed "Delete Message" instead of "Undelete Message" in context menu
Newsgroups could not be reorganized using drag-and-drop
Pausing updates on "Blog & News Feed" account did not dim account name after restarting Thunderbird
"Install Add-On" link did not work in install confirmation pop-up
Duplicate Matrix clients were created under certain circumstances, resulting in duplicate messages under the same account
Calendar time-of-day indicator increasingly drifted ahead of current time when staying on calendar tab without switching to other tabs
Clicking "Details..." button on invite in calendar did not show details
Unfocused notifications could incorrectly move focus around UI when navigating Thunderbird with keyboard
Message List was incorrectly announced as "tree view" to screenreaders when in unthreaded mode
Various visual and UX improvements
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Unified Toolbar customization now disabled until Spaces Toolbar has finished initializing
Mail, Calendar, and Task toolbar items migrated to Unified Toolbar; Old toolbars removed.
Quick Filter toolbar buttons now collapsed into a single "Filters" dropdown for small window sizes
HTML messages that set a favicon were able to change the mail tab icon
"Gentle smile" plain text ;) emoticons were incorrectly rendered as "Strong smile"/"Laugh"
Menu items in "View" toolbar did not work
Clicking "Junk" icon of non-Junk message in the Junk folder moved the message to the Inbox
Thread pane selection updated unnecessarily
Unified Folders improvements
Quick Filter improvements
Unified Toolbar button label styles improved
Folder context menus were shown on mode header lines
Upstream RNP version numbers now recognized as official in about:support
Screen readers did not automatically read the next message after deletion
Missing icon for non-secure mail accounts in "Get Messages" menu added
Changing Today Pane date with mini-month or mini-day display did not change the agenda date
OpenPGP signature filenames now always end in ".asc"
Added "Move Up" and "Move Down" options to Folder Mode context menu
Updated various strings for easier localization
RSS feed subscriptions could not be added via drag-and-drop
RSS feeds did not update unless "Remember websites and links I've visited" was checked
NNTP message streaming did not work, resulting in uncaught errors
Moving events by drag-and-drop in day view or week view did not display dragbox on drop target
When opening .ics file, "Import Calendar Events and Tasks" window could not be resized and window buttons were inaccessible outside border of window
Various UX improvements
"Tray icon always on" option did not work
Manually-configured accounts were silently deleted after pressing "Finish" on Account Setup page
Repairing local folders made messages in folder temporarily disappear
Loss of connection while moving multiple messages to an IMAP server could result in duplicate messages on source and destination servers
Star button did not appear as yellow when message was selected in card view
Incorrect context menu was shown for links in messages
Email attachments could be opened before being completely saved to disk
Expired OpenPGP keys were shown as "Not found" in Account Settings
Thunderbird now checks index page of news feeds for favicon if feed itself does not have favicon
Layout and styling issues with OpenPGP dialogs
Various UX improvements
Local keyboard navigation of Unified Toolbar is now possible
Filter field of quick filter bar was not cleared when switching folders
Folders did not always populate in Folder Pane when switching to Unified Folders
Folder "Properties" and "Favorite Folder" context menu items did not work
Thunderbird sometimes crashed when deleting folders
Message list did not always populate when selecting Unified Folders
Message list context menu could not consistently be opened using keyboard
Search folder message list did not update after modifying the folder
Quickly toggling columns in Message List opened the selected message
Subject lines longer than the available title bar width in "New Message" window displaced title bar buttons on macOS
Encrypted messages could not be decrypted using revoked OpenPGP key
Deleting or moving a contact from one address book to another did not update the list of cards
Various UX improvements
Copy, Move, and Move Again options in folder context menu are now positioned before Properties
Thunderbird now displays a warning when trying to send a message if the current OpenPGP key is expired
Unified Toolbar customizations could not be saved when only changing button style
Copying IMAP folders between servers failed when source folder was previously copied and deleted from destination server, and destination server is set to only mark items as deleted
Forwarding messages as attachment via drag-and-drop did not follow preference to add file extension to attachment file names
Message header was not displayed in message preview intermittently
Files saved via Save Attachment did not appear under Saved Files
Multi-part messages could not be converted to tasks
Thunderbird no longer requires a primary secret key to be available when signing messages
Thunderbird was unable to send signed messages with OpenPGP subkey
NNTP message headers were not shown
Encryption of new Matrix direct messages was not detected correctly
Matrix direct message rooms were duplicated under certain circumstances
OpenPGP Message Security dialog was sometimes positioned incorrectly
Various UX improvements
Vertical view
Mail Toolbar settings have not yet been migrated to new Unified Toolbar
WebExtension APIs are currently broken
Thunderbird "Supernova" related bugs