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Join UsVersion 83.0beta, first offered to channel users on October 22, 2020
Calendar: Category colors now displayed in category selection dropdown
Calendar: "Edit" item added to event context menu
MailExtensions: "compose_attachments" context added to Menus API
MailExtensions: Menus API now available on displayed messages
MailExtensions: Changed contact properties now passed in contact.onUpdated event
Searching global search results did not work
Link location was not focused by default when adding a hyperlink in message composer
Appmenu displayed visual glitches
Keyboard shortcut for toggling message "read" status not shown in menus
Chat: Previous conversations were not shown
Calendar: Subscribing to ICS calendars was not possible
Calendar: Reminder details appeared editable when viewing an event
Calendar: Two "Home" calendars were visible on a new profile
Thunderbird prompts for an address to use when starting an email from an address book entry with multiple addresses
OpenPGP public key import now supports multi-file selection
Advanced address book search dialog was unusable
Encrypted draft reply emails lost "Re:" prefix
Replying to a newsgroup message did not open the compose window
Unable to delete multiple newsgroup messages
Visual glitches when selecting multiple messages in the message pane and using Ctrl+click
Switching between dark and light mode could lead to unreadable text on macOS
OpenPGP: Added option to disable attaching the public key to a signed message
OpenPGP: Added option to disable email subject encryption
MailExtensions: browser.tabs.create will now wait for "mail-delayed-startup-finished" event
OpenPGP: Support for inline PGP messages improved
OpenPGP: Message security dialog showed unverified keys as unavailable
Calendar: HTML rendering in event descriptions restored
Chat: New chat contact menu item did not function
Theming improvements