Thunderbird 115.5.2 (64-bit)

What's new in this version:

Fixed:
- "Compact" option was missing from folder context menu for IMAP accounts using maildir
- Message list could not be properly read by screen readers in table view
- Messages with slow-loading images were delayed being marked as read
- Messages opened in background tab were incorrectly marked as read
- Mark All Read did not work for virtual folders
- Delete (trash icon) in message display did not work in Unified folders
- Unified folders were missing "Mark Folder Read" option in context menu
- "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
- Attachment list did not always appear if remote message content loaded slowly
- 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
- 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
- Message list scroll position could move randomly when switching folders
- Undoing deletion of local messages required using "Undo" (Ctrl-Z) twice
- IMAP messages deleted in Thunderbird still appeared in other email clients that don't respect messages marked "deleted"
- 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
- Images could not be copied and pasted from one message into another
- Troubleshooting page (about:support) did not work on profiles with no outgoing email server, such as news-only profiles
- 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
- Various accessibility improvements
- Various UX and visual improvements