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Join UsVersion 121.0beta, first offered to channel users on November 22, 2023
Messages opened in background tab were incorrectly marked as read
Thunderbird now attempts to reconnect on a new connection after SMTP 4xx errors
IMAP messages deleted in Thunderbird still appeared in other email clients that don't respect messages marked "\deleted"
Mark All Read did not work for virtual folders
Unified folders were missing "Mark Folder Read" option in context menu
Add tooltip displaying full folder path when hovering over location column of thread pane
"Reply to List" was incorrectly disabled in Unified Toolbar since Thunderbird 115.4.1
Sorting by column with "Grouped By" enabled then performing a quick filter search caused blank message pane
Star and junk icons showed incorrect state for selected-focused messages in table view
View menu in message window did not initialize correctly
Links with IP address as link text and destination incorrectly warned user that link text and destination did not match
Attachment list did not always appear if remote message content loaded slowly
OpenPGP signatures rejected due to mismatched signature timestamp now display signature timestamp and clarifying message
Advanced address book search did not return results if display name was left blank
Clicking on attendee when inviting attendees added the attendee twice
Various Cards View UX improvements
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Various UX and visual improvements
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3-pane view was blank after starting Thunderbird with unsent messages in outbox
Messages in outbox were not shown as unread by default
"Apply columns to" sometimes failed to apply columns to a root folder and its descendants
Global search results displayed as a list did not allow threads to be collapsed
"Quick Filter" button on toolbar was disabled when viewing search results as a list
Images could not be copied and pasted from one message into another
Undoing deletion of local messages required using "Undo" (Ctrl-Z) twice
Some labels were missing from Add-ons Manager
Troubleshooting page (about:support) did not work on profiles with no outgoing email server, such as news-only profiles
Windows taskbar icon did not have the "Beta" label
HTML FileLink attachments used the wrong encoding
IMAP folder discovery was slowed by status bar message updates
Servers with non-LDH (letters-digits-hyphens) hostnames, such as those containing non-ASCII Unicode characters, could not be found
High CPU usage sometimes occurred with IMAP CONDSTORE (conditional STORE) enabled
Replying to a collapsed thread via keyboard shortcut (Ctrl+R/Cmd+R) opened a reply for every message in the thread
Folder open hover delay was too short when using drag-and-drop
Parent folders with collapsed subfolders did not consistently display new mail indicator or message count for subfolders
Minimize/maximize button order was incorrect when placing window titlebar buttons on left-hand side
OpenPGP integraton with smartcard using latest version of Gpg4Win failed
Message list scroll position could move randomly when switching folders
macOS Contacts integration with Thunderbird address book did not work
Message selection misbehaved after selecting a sub-message in an expanded thread, collapsing the thread, then pressing up/down to move selection