Release Notes

Thunderbird Desktop

Version 78.1.1 | Released August 6, 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 78.1.1 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 Changed


Building OpenPGP shared library linked to system libraries now supported


MailExtension errors now shown in Developer Tools console by default


MailExtensions: Dynamic registration of calendar providers now supported

What’s Fixed


OpenPGP improvements


Message preview was sometimes blank after upgrading from Thunderbird 68


Email addresses whitelisted for remote content not displayed in preferences


Importing data from Seamonkey did not work


Renaming a mail list did not update the side bar


MailExtensions: messenger.* namespace was undefined

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

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