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Join UsVersion 88.0beta, first offered to channel users on March 26, 2021
Chat: Additional commands and events handled in Matrix
Chat: Support Matrix servers that require Single Sign-on
Chat: Send presence to Matrix servers
Calendar: Filter and sort items to be imported in the Import dialog
Mail: Adding an attachment no longer produces an animation when the operating system settings indicate that less motion is desired or preference ui.prefersReducedMotion is set to 1.
Mail Extensions: Changes and improvements - see developer documentation
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The default application confirmation dialog was displayed after each startup on Windows 10, even if Thunderbird is the default when "always check at startup" enabled
Mail: Subject column in message lists sometimes showed text from invalid email headers
Mail: Right clicking on a folder mode header made the folder tree unresponsive
Mail: When creating or renaming an IMAP folder, it was duplicated in the folder tree if multiple folder modes were selected
Mail: Could not open PDF attachments when "Open messages in new window" preference set
Mail: UI did not update properly after setting up a new email account
Mail: Print dialog would take a long time to appear if remote content in message loaded slowly
Mail: New message notifications sent to the OS were sometimes excessively large
Mail: There were multiple problems with the behavior of editing recipient address pills
Mail: Dragging an email into a compose window to attach it was broken
Mail: Spellcheck was mistakenly re-enabled when saving message as draft
Mail: On Mac, Cmd+Shift+Enter with focus on an address input would send immediately instead of the intended send later
Mail: Close tab button did not work when single-clicked with mail.tabs.closeButtons
set to 3
Mail: Message summary pane had usability issues when multiple messages were selected
Mail: Keyboard shortcut to open the Message Security popup did not work on Mac
Address Book: Linux shortcut for Advanced Address Book Search (Ctrl+Shift+F) did not work
Address Book: Import Address Book from CSV did not not allow mapping all available fields
Address Book: Radio buttons could not be selected on photo tab of an address card
Chat: Double clicking an account type in new account wizard did not select it
Chat: Matrix chat messages were not always associated with their participants correctly
Chat: /msg command in Matrix did not actually send the message
Calendar: There was a potential dataloss issue related to event reminders
Calendar: Could not reload .ics calendars unless calendars of other types also existed
Calendar: Import and export via CSV did not parse years correctly in event dates
Mail Extensions: messages.getRaw()
did not work for NNTP/news messages
Mail Extensions: contacts.quickSearch()
was failing on mailing lists
Mail Extensions: menus.onClicked()
did not keep the user input status so browserAction.openPopup()
could not be used
Preferences page on Windows did not have a setting for displaying an icon in the system tray
Delivery Status Notifications did not work in Thunderbird 88.0beta 1
Various issues with drag & dropped attachments
Calendar: Invites from Microsoft Teams did not display the meeting URL
Various UX and theme improvements
Calendar: webcal:// URL handler now registered on Windows
Some users could not send messages using new SMTP and MIME implementations
Hyperlinks in composed messages were duplicated after converting to plain text
Usability improvements to various dialogs on Windows
Clicking a notification dialog did not open a Thunderbird window when minimize-to-tray was active