Release Notes

Thunderbird Desktop

Version 91.1.1 | Released September 16, 2021

Check out the notes below for this version of Thunderbird. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla.

** Thunderbird 91 is only offered as direct download from thunderbird.net and not as an upgrade from Thunderbird version 78 or earlier.** A future release will provide updates from earlier versions.

System Requirements: Details

  • Windows: Windows 7 or later
  • macOS: macOS 10.12 or later (macOS 11.0 for Silicon)
  • Linux: GTK+ 3.14 or higher

What’s New

new

Menu item for disabling subject encryption for a single message added

What’s Changed

changed

Printing messages that are not currently displayed is no longer supported, including printing multiple messages at once

What’s Fixed

fixed

Buttons on compose window dialogs did not have a visual indication of focus

fixed

Dropdown fields in message compose window were unreadable on Windows 7 with a dark theme

fixed

Multiple bulk mail notification warnings were displayed

fixed

Enabled/Disabled state of message filters did not persist as expected

fixed

Printing a message did not print a list of its attachments

fixed

Images attached from a web page were not sent as expected

fixed

OpenPGP public key was attached multiple times when forwading a message

fixed

Windows tray icon disappeared if Thunderbird was started by a shortcut with "Run" set to "Minimized"

fixed

Windows tray message count badge displayed the "unread" count instead of the "new" message count

fixed

Some downstream Thunderbird builds were incorrectly checking addons for a signature, causing all addons to be disabled

fixed

Addressbooks set up with autoconfig showed no search results

fixed

Various CardDAV setup and auto-detection fixes

fixed

Dates (such as birthday) stored in contacts may display the wrong date; a one-time manual fix may be needed for dates that are incorrect.

fixed

Attached VCards displayed as plain text when an email was HTML formatted

fixed

Mailing list names with non-ASCII characters incorrectly displayed with an error

fixed

LDAP directories were not searched for matches when adding recipients to an email

fixed

Clicking "Connect to an LDAP address book" in account setup opened CardDAV setup dialog

fixed

LDAP address books using Kerberos/GSS-API authentication did not authenticate

fixed

LDAP search queries containing non-ASCII characters produced no results

fixed

IRC server connections did not automatically retry after a timeout

fixed

Calendar event editor did not honor mail.spellcheck.inline

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