Release Notes

Thunderbird Desktop

Version 78.3.0 | Released September 24, 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.

Frequent crashes were reported after updating to Thunderbird 78.3.0. Thunderbird 78.3.1 is now available with a fix.

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 Changed

changed

OpenPGP: Improved decryption performance with large messages

changed

OpenPGP: Do not show external key UI when disabled by preference

changed

Account setup wizard will now open a popup when connecting to a server with a self-signed SSL/TLS certificate

changed

Installation of "legacy" MailExtensions now disabled

changed

Reply-To header moved in compose window; now appears under From header

changed

Calendar: Sidebar UI improvements

What’s Fixed

fixed

Selecting "Cancel" on the Master Password prompt at startup incorrectly reported corrupted OpenPGP data

fixed

OpenPGP: Creating a new key pair did not automatically select it for use

fixed

Dragging & Dropping recipient pills resulted in lost pills when an error was present

fixed

Spellcheck suggestions were unreadable in dark theme

fixed

Calendar: Multiple password prompts opened

fixed

Linux Distributions: UI was not rendered completely when built without updater

fixed

MailExtensions: browser.folders.delete failed on IMAP folders

fixed

Various security fixes

Known Issues

unresolved

Message list is not focused at startup

Learn What’s Next

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