Release Notes

Thunderbird Desktop

Version 78.6.0 | Released December 15, 2020

Check out the notes below for this version of Thunderbird. As always, you’re encouraged to tell us what you think, ask for help, or file a bug in Bugzilla.

For more on all of the new features in Thunderbird 78, see New in Thunderbird 78.0.

System Requirements: Details

  • Windows: Windows 7 or later
  • Mac: macOS 10.9 or later
  • Linux: GTK+ 3.14 or higher

What’s New

new

MailExtensions: Added browser.windows.openDefaultBrowser()

What’s Changed

changed

Thunderbird now only shows quota exceeded indications on the main window

changed

MailExtensions: menus API enabled in messages being composed

changed

MailExtensions: Honor allowScriptsToClose argument in windows.create API function

changed

MailExtensions: APIs that returned an accountId will reflect the account the message belongs to, not what is stored in message headers

What’s Fixed

fixed

Keyboard shortcut for toggling message "read" status not shown in menus

fixed

OpenPGP: After importing a secret key, Key Manager displayed properties of the wrong key

fixed

OpenPGP: Inline PGP parsing improvements

fixed

OpenPGP: Discovering keys online via Key Manager sometimes failed on Linux

fixed

OpenPGP: Encrypted attachment "Decrypt and Open/Save As" did not work

fixed

OpenPGP: Importing keys failed on macOS

fixed

OpenPGP: Verification of clear signed UTF-8 text failed

fixed

Address book: Some columns incorrectly displayed no data

fixed

Address book: The address book view did not update after changing the name format in the menu

fixed

Calendar: Could not import an ICS file into a CalDAV calendar

fixed

Calendar: Two "Home" calendars were visible on a new profile

fixed

Calendar: Dark theme was incomplete on Linux

fixed

Dark theme did not apply to new mail notification popups

fixed

Folder icon, message list, and contact side bar visual improvements

fixed

MailExtensions: HTTP refresh in browser content tabs did not work

fixed

MailExtensions: messageDisplayScripts failed to run in main window

fixed

Various security fixes

Known Issues

unresolved

Thunderbird performs sluggishly on macOS Big Sur

Learn What’s Next

Thunderbird keeps getting better. Subscribe to our newsletter and follow us on social media to stay informed.