Release Notes

Thunderbird Desktop

Version 78.1.0 | Released July 30, 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.

** Thunderbird version 78.1.0 is only offered as direct download from and not as an upgrade from Thunderbird version 68 or earlier.** A future release will provide updates from earlier versions. Automatic updates are available for users already running version 78.0 or higher.

Add-on support: As of version 78.0, Thunderbird only supports MailExtensions. Your favorite add-ons may not have been updated for compatibility.

At this time, users of the Enigmail Add-on should not update to Thunderbird 78.

OpenPGP in Thunderbird 78.1.0 has reached feature complete state, but it's still disabled by default, to allow more time for testing, correctness, and localization. See the wiki for how to enable and help with testing.

System Requirements: Details

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

What’s New


OpenPGP support is now feature complete. Improvements: new Key Wizard, online searching for OpenPGP keys, and more


The preferences tab now has a search field

What’s Changed


Dark background in message reader is now disabled

What’s Fixed


Thunderbird startup was slow when using folder color customizations with many folders. Previously configured colors will not be migrated.


Mail quota usage in status bar did not support terabyte folder sizes


Changing Junk mail settings with keyboard toggled wrong setting


Advanced IMAP server preferences not saved in Account Manager


Address book migration updates and fixes


Address book: Last Modified Date was not updated


Dark mode improvements


Various security fixes

Known Issues


Mail header toolbar (Reply, Forward, Archive, Junk buttons) no longer configurable


Fixed width font not working in compose window

Learn What’s Next

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