Download Mozilla Thunderbird 91.1.1

The Mozilla Foundation has released version 91.1.1 of Thunderbird. Thunderbird is an open source email and newsgroup client, with features such as support for several mail and news accounts, a spam filter, spell checker, and a customizable look and feel. In version 91 has included a warning when an email is sent to a possibly non-existent address, or when there are too many addresses on the public address line. There is also support for CardDAV and there is a native client for a Mac equipped with an Apple Silicon processor.

At the moment it is not yet possible to do an automatic update from version 78 to 91. An existing installation can be updated by manually downloading and running the installation file. This automatic migration will be added in a future version. The following changes and improvements have also been made in this release:

What’s New

• Menu item for disabling subject encryption for a single message added

changes

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

Fixes

• Buttons on compose window dialogs did not have a visual indication of focus
• Dropdown fields in message compose window were unreadable on Windows 7 with a dark theme
• Multiple bulk mail notification warnings were displayed
• Enabled/Disabled state of message filters did not persist as expected
• Printing a message did not print a list of its attachments
• Images attached from a web page were not sent as expected
• OpenPGP public key was attached multiple times when forwading a message
• Windows tray icon disappeared if Thunderbird was started by a shortcut with “Run” set to “Minimized”
• Windows tray message count badge displayed the “unread” count instead of the “new” message count
• Some downstream Thunderbird builds were incorrectly checking addons for a signature, causing all addons to be disabled
• Addressbooks set up with autoconfig showed no search results
• Various CardDAV setup and auto-detection fixes
• 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.
• Attached VCards displayed as plain text when an email was HTML formatted
• Mailing list names with non-ASCII characters incorrectly displayed with an error
• LDAP directories were not searched for matches when adding recipients to an email
• Clicking “Connect to an LDAP address book” in account setup opened CardDAV setup dialog
• LDAP address books using Kerberos/GSS-API authentication did not authenticate
• LDAP search queries containing non-ASCII characters produced no results
• IRC server connections did not automatically retry after a timeout
• Calendar event editor did not honor mail.spellcheck.inline