Thunderbird Desktop
Version 153.4.0esr | Released September 30, 2026
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 153, see Thunderbird 153 Meadow FAQ
For more on all the new features in Thunderbird 153, see What’s New in Thunderbird 153.
System Requirements: Details
What’s Changed
changed
RNP command-line utilities are no longer included with Thunderbird
changed
Thundermail built-in add-on updated to v2.0.16
What’s Fixed
fixed
Ctrl+Shift+K could fail to open the Quick Filter UI
fixed
Nested S/MIME signed parts could fail to render
fixed
Thunderbird could hang when waiting for IMAP server greeting during account setup
fixed
Gmail OAuth2 authentication could intermittently fail on Windows
fixed
AppUpdatePin policy did not prevent Thunderbird from updating beyond pinned version
fixed
"What's New?" linked to Release channel notes instead of ESR release notes
