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New Account Hub for centralized account setup
Redesigned recipient address fields (To, Cc, Bcc) as single-line input fields (pills) for multiple addresses instead of one line per address. More improvements to come.
Color customization of Folder Pane icons
Allow selecting messages via selection boxes instead of classic selection. "Select Messages" column needs to be selected via the thread pane's column picker.
"Delete" action column in thread pane (message list). "Select Messages" column needs to be selected via the thread pane's column picker.
Themes can be previewed in the Add-On Manager
Minimize to tray support added for Windows
New config option to anonymize message date header
Global Search menu item in app menu
Additional Enterprise policies
Calendar: Added ICS import support to -file command line option
Calendar: Add event preview to ICS import dialog
Chat: OTR messaging support
Chat: IRC echo-message capability
Add-on support: As of version 78.0, Thunderbird only supports MailExtensions and MailExtension Experiments. Restartless add-ons and non-restartless legacy add-ons using XUL overlays are no longer supported.
**As of version 78.0, "sideloaded" extensions are no longer supported. Enterprise administrators can deploy extensions using policies.
Linux minimum runtime requirements have changed: GTK 3.14, GLIBC 2.17, libstdc++ 4.8.1 Details
Thunderbird Options/Preferences tab redesigned and with new user interface
Account creation dialog redesigned and with new user interface
Account Manager moved to a tab
Add-ons manager with new user interface and notifications
Improved "Recent" folder list for "Move to" and "Copy to" in message context menu
Improved UI of global search results tab
Improvements to the location bar of a tab displaying web pages
Use scalable icons throughout Thunderbird to improve support for HiDPI monitors and dark mode
Address books are now stored as SQLite databases to prepare for future addressbook improvements. Existing address books in MAB format (using a Mork database) will be converted.
New parser and formatter for vCard. vCard versions 3.0 and 4.0 are now supported.
Various theme and dark mode improvements
Various look and feel improvements
Improved dialog for folder compaction (purging of deleted messages)
Graphics hardware acceleration is now enabled by default
TLS 1.0 and 1.1 disabled
Calendar: The Lightning calendar add-on is now integrated into Thunderbird
Calendar: Lightning version removed from Thunderbird user agent string
Calendar: Web Calendar Access Protocol (WCAP) support removed
Calendar: Storage access is now asynchronous to improve performance
Calendar: Location URLs are now clickable
Addon Developers: Updates to and expansion of MailExtensions APIs. Details
Password display font had characters that were difficult to read
When copying messages from an IMAP folder to a local folder, offline store wasn't used
While Thunderbird was in safe mode, the help menu did not offer an item to restart with add-ons enabled
Mailbox quotas not displayed correctly
Images not rotated when composing a message
Email addresses sometimes displayed incorrectly in message composer
Many accessibility fixes and improvements: message composer, account setup, attachment pane
Mailbox format conversion fixes
Address book improvements: exporting, editing contacts, contact photos
Chat: Renaming contacts in context menu did not work
Calendar: Task and event dialogs were sometimes too small for their content
Calendar: URLs in the event reminder dialog were not clickable
Various security fixes
Mail header toolbar (Reply, Forward, Archive, Junk buttons) no longer configurable
Preferences search not available
Drag and drop of address book contacts not working in some situations