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Native support for macOS devices built with Apple Silicon CPUs
New user interface for adding attachments
Clicking on an already-selected pill in the recipient list will now allow editing the address
Movemail support was removed
Copying a large message to an IMAP server would sometimes prematurely display a time-out error
Spaces following soft line breaks in messages using quoted-printable and format=flowed were incorrectly encoded; existing messages which were previously incorrectly encoded may now display with some words not separated by a space
Context menu did not open in the message source window
Directory for saving multiple attachments was not remembered between saves
Newly-added identities were not listed in the account manager until it was closed and reopened
Message headers in compose window disregarded manual resizing when adding additional recipients
Changing the language of the spellchecker did not work in while compose window was open
Opening a message from the command-line using "-mail <URL>" failed
OpenPGP: Various errors when importing keys
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OpenPGP: Messages with a high compression ratio (over 10x) could not be decrypted
Some labels in global search results were blank
Address Book: Syncing a read-only Google address book via CardDAV failed
Address Book: Preferences related to an address book were not removed when the address book was deleted
Address Book: CardDAV sync errors did not retry until Thunderbird was restarted
Calendar: Events from a disabled calendar were still visible
Calendar: Changing the cache mode of a CalDAV calendar connection would lose the username of the account
Calendar: Add-on calendars were sometimes not visible after restarting
Calendar: The preview for a recurring task did not use all available space in the dialog window
Calendar: Removing a recurring task was not possible
Installer: Option to keep distribution directory on upgrade did not work
Various UI fixes for macOS: Quick Filter toolbar, Today Pane, message threads
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Various theme improvements
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MailExtensions: Calling alert() and related functions from a composeScript failed
MailExtensions: Allow keyboard shortcuts to be added to composeAction buttons in the message compose window
Account provisioner did not properly handle UTF-8 data
New mail notification displayed old messages that were unread
New mail notification did not occur for newly arrived messages if previously received mail was unread
Signed messages without a public key were sent with an incorrect mime-type, causing display issues in other mail clients
MailExtensions: Options pages opened in a tab did not have access to MailExtension APIs through the browser/messenger object
Entry field in "search messages" dialog did not expand to fill available width
Dialog displayed after importing messages from Outlook showed incomplete results
Support recipient aliases for OpenPGP encryption. Documentation can be found here.
If an add-on has preferences, they can now be accessed via a button next to that add-on in the Add-Ons Manager.
The drop zones for "insert inline" and "add attachment" when dragging an image into a message were repositioned to be more intuitive.
Some fields were unreadable in the Dark theme in the General preferences panel.
Sending a message containing an anchor tag with an invalid data URI would fail.
When switching tabs, the focus was not moved to something in the new tab, potentially causing keyboard and menu actions to interact with a field you can no longer see.
When forwarding a message with multiple attachments, not all of the attachments were visible.
When dragging an attachment into a message and then quickly dragging it back out again, the drop zone did not disappear, preventing further interaction with the message.
Address Book: Importing VCards with non-ascii characters would fail.
Address Book: Some values may not have been parsed when syncing from Google address books.
The key and signature parts of the message security popup on a received message could not be selected for copy/paste.