Thunderbird Desktop
Version 140.3.0esr | Released September 16, 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
Right-clicking 'List-ID' -> 'Unsubscribe' created double encoded draft subject
fixed
Thunderbird could crash on startup
fixed
Thunderbird could crash when importing mail
fixed
Opening Website header link in RSS feed incorrectly re-encoded URL parameters
