Thunderbird Desktop
Version 150.0beta | Released March 25, 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.
These notes apply to Thunderbird version 150 beta 5 released Apr 15, 2026.
System Requirements: Details
- Windows: Windows 10 or later
- Mac: macOS 10.15 or later
- Linux: GTK+ 3.14 or higher
What’s New
new
'Recent Destinations' in General Settings now supports alphabetical sorting
new
Added support for generating Unobtrusive Signatures (OpenPGP)
new
Message body search enabled for OpenPGP and S/MIME encrypted messages
new
Account hub is opened on the first run of Thunderbird
new
Address book cards can be copied to the clipboard as vCard
new
Custom Accent Color can be chosen in Appearance Settings
new
Enable new calendar event view dialog with calendar.dialogs.new.enabled
new
Calendar month/multiweek views are now scrollable with touch screen
new
PDF pages can be reorganized directly in the PDF viewer
What’s Fixed
fixed
Unknown command-line arguments passed to Thunderbird did not print warning
fixed
Saved email filenames were not not always cross-platform safe
fixed
Compose progress dialog used unlocalised folder name
fixed
Clicking on a folder in the folder pane did not always open folder
fixed
Accounts could be listed twice after adding new account
fixed
Account Hub manual configuration was missing OAuth2 option
fixed
Microsoft Store installs did not open when clicking 'news://' link or .eml file
fixed
Folder states were not exposed to screen readers in saved search properties
fixed
Mailbox name was not announced and message count was incorrect for screen readers
fixed
POP3 could stop downloading mail until restart
fixed
Exchange servers/clients caused memory leaks by holding mutual references
fixed
'Move to New Window' option for the calendar was disabled
fixed
Visual and UX improvements
Fixed in beta 2
What’s Changed
changed
There are no Thunderbird changes requiring release notes in this release
Fixed in beta 3
What’s Fixed
fixed
Thunderbird could crash when creating a folder
fixed
Authentication could fail for some exchange accounts
fixed
Visual and UX improvements
Fixed in beta 4
What’s Changed
changed
Flatpak beta app ID changed from org.mozilla.Thunderbird to org.mozilla.thunderbird
What’s Fixed
fixed
Could not scroll to message bottom or view all attachments in some cases
fixed
Calendar view had date and time axes swapped
Fixed in beta 5
What’s Fixed
fixed
Could not scroll to bottom of message body and attachments in some cases
