New
• Support dark reader for the message pane
Changed
• Removed obsolete preference extensions.overlayloader.loglevel
• Increased the auto-compaction threshold to reduce frequency of compaction
• Display junk state and allow toggling it from top of message context menu
• Subscribe/Unsubscribe buttons were removed from the IMAP subscribe dialog
Fixed
• Fixed startup crash related to mailbox parsing
• Folder corruption could cause Thunderbird to freeze and become unusable
• IMAP could crash when reading cached messages
• Enabling "Show Folder Size" on Maildir profile could render Thunderbird unusable
• Folder compaction was not abandoned on shutdown
• Recently deleted messages could become undeleted if message compaction failed
• Message corruption could be propagated when reading mbox
• Messages corrupted by folder compaction were only fixed by user intervention
• Reading a message from past the end of an mbox file did not cause an error
• View -> Folders had duplicate F access keys
• Total message count for favorite folders did not work consistently
• Collapsed NNTP thread incorrectly indicated there were unread messages
• Disabling "Grouped by sort" while group header selected could break message pane
• Switching from "All", "Unread", and "Threads with unread" did not work
• Navigating to next unread message did not wait for all messages to be loaded
• Folder compaction did not clean up on failure
• Add-ons adding columns to the message list could fail and cause display issue
• Could not open attached file in a MIME encrypted message
• Unable to send an unencrypted response to an OpenPGP encrypted message
• Remote content notifications were broken with encrypted messages
• Updating criteria of a saved search resulted in poor search performance
• Drag and drop of OS folders as attachments was not prevented
• Unable to generate QR codes when exporting to mobile in some cases
• Opening the Account Manager produced console error
• Account creation "Setup Documentation" link was broken
• QR codes were not scannable by Android app when using most high-contrast themes
• Operating system reauthentication was missing when exporting QR codes for mobile
• New mail notification was not hidden after reading the new message
• Windows "Notifications & actions" did not display the Thunderbird icon
• "Empty trash on exit" and "Expunge inbox on exit" did not always work
• Message could disappear after moving from IMAP folder followed by Undo and Redo
• Global database did not work immediately after update to Thunderbird 133
• Drop-downs may not work in some places
• Primary password prompt cancellation during mobile export was confusing
• Calendar display times could be incorrect
• Selected calendar day did not move forward at midnight
• Could not drag all-day events from one day to another in week view
• Calendar could show mixed languages in month display
• Calendar displayed incorrect first day of the week
• Visual and UX improvements
• Security fixes