Thunderbird Desktop
Version 153.5.0esr | Released October 13, 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 Fixed
fixed
Attach File dialog failed to open when the previously used folder was unavailable
fixed
Troubleshooting falsely reported crash reports were not configured when available
fixed
Switching to Unified Folders could leave All Folders enabled and not change view
fixed
Archived Inbox folders ignored localized names and appeared as "INBOX"
fixed
Plain-text inline forwards omitted signatures placed below the quote
