Software Update: Mozilla Thunderbird 78.12.0

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The Mozilla Foundation has released version 78.12.0 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 78, a dark mode has been added and other parts of the interface, such as the icons and the screen for composing an email, have also been overhauled. Furthermore, the Lightning calendar add-on is now a standard part of the program, there is a new wizard for the first use and only MailExtensions add-ons are supported. The following changes and improvements have been made in this release.


  • Sending an email containing HTML links with spaces in the URL sometimes resulted in broken links
  • Folder Pane display theme fixes for macOS
  • Chat account settings did not always save as expected
  • RSS feed subscriptions sometimes lost
  • Calendar: A parsing error for alarm triggers of type “DURATION” caused sync problems for some users
  • Various security fixes

Version number 78.12.0
Release status Final
Operating systems Windows 7, Linux, macOS, Windows 8, Windows 10
Website Mozilla Foundation
License type Freeware
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