Thunderbird Desktop
Version 74.0beta | Released February 17, 2020
Check out the notes below for this version of Thunderbird. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla.
These notes apply to Thunderbird version 74 beta 2 released February 28, 2020.
Thunderbird 74 integrates Lightning, Thunderbird's calendar add-on, into Thunderbird.
If you have installed Lightning, it will be automatically removed. Refer to this Calendar troubleshooting article in case of problems.
Thunderbird 74 no longer supports "legacy" extensions.
What’s New
new
MailExtensions: API to block sending a message from compose window
new
MailExtensions: API to interact with message in compose window
What’s Changed
changed
Add-on support: As of version 74.0 beta, Thunderbird only supports MailExtensions and MailExtension Experiments. Restartless add-ons and non-restartless legacy add-ons using XUL overlays are no longer supported.
changed
Calendar: The Lightning calendar add-on is now integrated into Thunderbird
changed
Account Manager moved to a tab
changed
Improved UI of global search results tab
changed
MailExtensions: Allow commands.update() to disable a command
changed
MailExtensions: Allow browser.query.messages to query by tag
changed
MailExtensions: Changed folder enumeration to return tree structure rather than list
changed
MailExtensions: Exposed message "Junk" status to addons
What’s Fixed
fixed
When copying messages from an IMAP folder to a local folder, offline store wasn't used
fixed
SMTP timeout when forwarding message via filter
fixed
Partial updates not working
fixed
Thread collapsed when opening news message in a new window
fixed
Addons not automatically updated to compatible version after upgrade from Thunderbird 60
fixed
Opening the properties of a folder sometimes hung on Mac
fixed
Multiple master password prompts. Fixed by prompting for master password at startup time.
fixed
Offline replication of LDAP databases sometimes failed to replace an earlier copy
fixed
Calendar: Last day of multiple-day event not displayed
fixed
Chat: Avatars not displayed in tooltips
Changed and Fixed in Beta 2
What’s Changed
changed
Thunderbird will now display a popup window when starting up on a new profile
changed
MailExtensions: Action APIs now provide tab and click information
changed
MailExtensions: Allow composeAction to open popups from onBeforeSend
What’s Fixed
fixed
Long subject lines did not wrap in message header
fixed
Account Manager in tab not consistent with Options/Preferences in tab
fixed
"Get New Messages for All Accounts" not working for OAuth2-authenticated IMAP accounts
fixed
Searching in message bodies led to false negatives under some circumstances in quoted-printable encoded HTML bodies
fixed
Calendar: Starting with 74.0 beta 2, building Thunderbird with --enable-calendar is deprecated, and should be removed from your mozconfig file
fixed
Chat: macOS users were not be able to connect to a server
Known Issues
unresolved
WebExtension toolbar button badges not displayed
unresolved
Address auto-completion not working on Mac if the Mac address book is enabled (File > Use Mac OS X Address Book)