Release Notes

Thunderbird Desktop

Version 78.4.3 | Released November 11, 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.

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 Fixed


User interface was inconsistent when switching from the default theme to the dark theme and back to the default theme


Email subject would disappear when hovering over it with the mouse when using Windows 7 Classic theme

Known Issues


Message list is not focused at startup

Learn What’s Next

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