Download Mozilla Thunderbird 91.3.1

The Mozilla Foundation has released version 91.3.1 of Thunderbird. Thunderbird is an open source client for e-mail and newsgroups, with features such as support for various mail and news accounts, a spam filter, spell checker, and a customizable appearance. In version 91 has included a warning when an email is sent to a potentially non-existent address, or if 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. An update to 91 is now being offered from version 78. The following changes and improvements have also been made in this release:

changes

• OpenPGP public keys will no longer count as an attachment in the message list
• Adding a search engine via URL now supported
• FileLink messages’ template updated; Thunderbird advertisement removed
• After an update, Thunderbird will now check installed addons for updates

Fixes

• New mail popups were displayed while running full screen applications
• Messages received with non-standard “koi8r” encoding were not supported
• Various macOS stability improvements
• PDF attachments opened in Firefox while composing an email
• Addons were disabled when “Offline Settings” were set to “Ask me for online state (on startup)”
• Clicking ‘”addons://” links in the Addons Manager prompted for an application to open it, rather than opening internally
• The Contacts sidebar “Address Book” drop down was unreadable on Windows
• vCard attachments were not shown when using “inline” view for attachments
• Importing an ICS file with TODO items failed