Thunderbird Desktop
Version 143.0 | 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.
System Requirements: Details
- Windows: Windows 10 or later
- Mac: macOS 10.15 or later
- Linux: GTK+ 3.14 or higher
What’s Fixed
fixed
Web pages with bad certificates displayed as blank
fixed
Users could no longer send using smtp-relay.gmail.com
fixed
Changing to new drafts folder and then back did not correctly restore the folder
fixed
Option did not exist to create new address book under File -> New
fixed
Some folders showed new mail count prior to receiving mail
fixed
Menu bar was hidden after updating from 128esr to 140esr
fixed
Menu Bar -> View contained duplicate accelerator keys
fixed
Warning was not logged if mail.openpgp.alias_rules_file file did not exist
fixed
Cmd+Shift+F no longer invoked "Search Messages" on macOS
fixed
Arrow key selection in global search bar skipped every other result
fixed
Drag-drop of unselected contact inserted wrong or no email address
fixed
Thunderbird could crash on startup
fixed
Adding an account could fail and cause UI hang
fixed
Thunderbird could crash when importing mail
fixed
Windows new message notification click did not bring Thunderbird to foreground
fixed
Delete or detach attachments did not work for some IMAP servers
fixed
Saving a new draft retained superceded version
fixed
Language field in settings was empty after restart in Troubleshoot Mode
fixed
Visual and UX improvements
