Release Notes

Thunderbird Desktop

Version 115.3.3 | Released October 18, 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


Modifier keys did not work as expected when dragging a message over the folder tree on macOS


"Folder Location" toolbar button did not work for local folders


"Copy to again" option disappeared from context menu after copying to Gmail folder with non-ASCII name


Default reply identity did not use "Delivered-To" address when catch-all was active


"View Headers All" did not work when selected in standalone message window


Viewing the mail filter log displayed an error if no log file was present

Learn What’s Next

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