Thunderbird Desktop
Version 140.5.0esr | Released November 12, 2025
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.
For help and a quick start on Thunderbird 140, see Thunderbird 140 Eclipse FAQ
For more on all the new features in Thunderbird 140, see What’s New in Thunderbird 140.
System Requirements: Details
- Windows: Windows 10 or later
- Mac: macOS 10.15 or later
- Linux: GTK+ 3.14 or higher
What’s Fixed
fixed
Could not drag and drop ICS file to Today Pane
fixed
With Thunderbird closed, clicking a 'mailto:' link to send signed message failed
fixed
Upgrade from 128.x->140.x broke authentication for @att.net using Yahoo backend
