Thunderbird Desktop
Version 135.0beta | Released January 13, 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.
These notes apply to Thunderbird version 135 beta 3 released January 22, 2025.
System Requirements: Details
- Windows: Windows 10 or later
- Mac: macOS 10.15 or later
- Linux: GTK+ 3.14 or higher
What’s New
new
Add-ons: Added support for specifying a cookieStoreId when creating a space
What’s Changed
changed
CardDAV address books and calendars now use the same OAuth2 code as mail
changed
Ignore unsupported subkeys/signatures when importing compliant OpenPGP keys
changed
Add-ons: browser.messages.listAttachments() now returns attachment headers
changed
Set show missed reminders preference to false by default
What’s Fixed
fixed
Compacting an empty folder failed with write error
fixed
Compacting of IMAP folder with corrupted local storage failed with write error
fixed
POP3 'fetch headers only' and 'get selected messages' could delete messages
fixed
'Search Online' checkbox in saved search properties was incorrectly disabled
fixed
Dragging threaded emails to another folder left a summary in the message panel
fixed
POP3 status message showed incorrect download count when messages were deleted
fixed
Thunderbird could show incorrect 'From' and 'To' fields for mailing list emails
fixed
mail.compose.other.header wrongly added fields to message preview pane headers
fixed
Space bar did not always advance to the next unread message
fixed
Folder creation or renaming failed due to incorrect preference settings
fixed
After restart, all restored tabs with opened PDFs showed the same attachment
fixed
Shutdown could hang due to unterminated search execution
fixed
Sort order in 'Search Messages' panel reset after search or on first launch
fixed
Reply window added an unnecessary third blank line at the top
fixed
Thunderbird spell check box did not allow ENTER to accept suggested changes
fixed
Thunderbird did not warn when replying to a 'noreply' address containing a '+'
fixed
'Please fill out this field' in account setup always appeared in English
fixed
Add-ons: Links in content pages with a target attribute loaded a blank page
fixed
Double clicking a new contact icon added the contact to the address book twice
fixed
POP3 'fetch headers only' and 'get selected messages' could skip some messages
fixed
Thunderbird logged network errors in console when used in offline mode
fixed
'Prefer client-side email scheduling' needed to be selected twice
fixed
Calendar print misaligned days (Mon-Sun) with their correct dates
fixed
Duplicate invitations were sent if CALDAV calendar email case did not match
fixed
Thunderbird calendar failed to show attendee as busy when added to an event
fixed
Visual and UX improvements
Fixed in beta 2
What’s Fixed
fixed
Race condition in folder compaction could cause unexpected behavior
fixed
Data corruption occurred when compacting IMAP Drafts folder after saving a message
fixed
Long email subject lines could overlap window control buttons on macOS
fixed
Exceptions during CalDAV item processing would halt subsequent item handling
Fixed in beta 3
What’s Fixed
fixed
Link at about:rights pointed to Firefox privacy policy instead of Thunderbird's
fixed
fixed
Forwarding/editing S/MIME drafts/templates unusable due to regression
