Release Notes

Thunderbird Desktop

Version 115.5.0 | Released November 21, 2023

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 help and a quick start on Thunderbird 115, see Thunderbird 115 Supernova FAQ.

For more on all the new features in Thunderbird 115, see What’s New in Thunderbird 115.

System Requirements: Details

  • Windows: Windows 7 or later
  • Mac: macOS 10.12 or later
  • Linux: GTK+ 3.14 or higher

What’s Fixed


Initial message was not automatically selected when opened in conversation


Newsgroup users using FQDN identity generated message ID headers with incorrect domain name


Link previews had poor legibility in dark mode


Plasma's task switcher displayed the default icon when running the Thunderbird Flatpak on Wayland


Link to Flatpak manifest was incorrect

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