Release Notes

Thunderbird Desktop

Version 91.3.1 | Released November 15, 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.

For more on all the new features in Thunderbird 91, see New in Thunderbird 91.0.

System Requirements: Details

  • Windows: Windows 7 or later
  • Mac: macOS 10.12 or later
  • Linux: GTK+ 3.14 or higher

What’s Changed

changed

OpenPGP public keys will no longer count as an attachment in the message list

changed

Adding a search engine via URL now supported

changed

FileLink messages' template updated; Thunderbird advertisement removed

changed

After an update, Thunderbird will now check installed addons for updates

What’s Fixed

fixed

New mail popups were displayed while running full screen applications

fixed

Messages received with non-standard "koi8r" encoding were not supported

fixed

Various macOS stability improvements

fixed

PDF attachments opened in Firefox while composing an email

fixed

Addons were disabled when "Offline Settings" were set to "Ask me for online state (on startup)"

fixed

Clicking '"addons://" links in the Addons Manager prompted for an application to open it, rather than opening internally

fixed

The Contacts sidebar "Address Book" drop down was unreadable on Windows

fixed

vCard attachments were not shown when using "inline" view for attachments

fixed

Importing an ICS file with TODO items failed

Learn What’s Next

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