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Join UsVersion 117.0beta, first offered to channel users on August 2, 2023
Unencrypted HTTP URLs (URLs beginning with http:// instead of https://) can no longer be used to link to a contact photo
Unread message count badge was not displayed on parent folders of subfolder containing unread messages
"Undo archive" (via Ctrl-Z) did not un-archive previously archived messages
Message compose window did not apply theme colors to menus
Unified Toolbar buttons sometimes displayed inconsistent margins
Width of icon columns (like Junk or Starred) in message list did not adjust when UI density was changed
Thunderbird version number and details in "About" dialog were not automatically read by screen readers when first opening dialog
Reading the second new message in a folder cleared the unread indicator of all other new messages
Folder database intermittently became out-of-date when flagging messages or marking them as read
"New" button dropdown menu in "Message Filters" dialog could not be opened via keyboard navigation
"Download all headers" option in NNTP "Download Headers" dialog was incorrectly selected by default
"Show New Mail Alert for" input field in "Customize New Mail Alert" dialog had zero width when using certain language packs
"Account Wizard" dialog was too narrow when adding a news server, partially hiding confirmation buttons
Various visual and UX improvements
Remote content exceptions could not be added
Deleting a message from the context menu with messages sorted in chronological order and smooth scroll enabled caused message list to scroll to top
Newsgroup list file did not get updated after adding a new NNTP server
Repeatedly switching accounts in Subscribe dialog caused tree view to stop updating
Link Properties and Image Properties dialogs in the composer were too wide
Newsgroup names in message list header are now abbreviated
HTML emails did not print correctly
"Ignore thread" caused message cards to display incorrectly in message list
Beta 5 canceled
Thunderbird MSIX packages are now published on archive.mozilla.org
Size, Unread, and Total columns are now right-aligned
Account Manager did not resize to fit content, causing "Close" button to become hidden outside bounds of dialog when too many accounts were listed
New mail notification always opened message in message pane, even if pane was disabled
Creating tags from unified toolbar failed
Cross-folder navigation using F and N did not work
Incorrect message was selected under certain circumstances
"Convert to event/task" was missing from mail context menu
Events and tasks were not shown in some cases despite being present on remote server