Software Update: Mozilla Thunderbird 78.2.2

The Mozilla Foundation has released version 78.2.2 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 we find, among other things, a dark mode and other parts of the interface, such as the icons and the screen for composing an email, have been taken care of. 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. An automatic update from 68.x to 78.x is not yet possible, but can be done manually. The changelog for this release looks like this:

What’s New

  • Drag and Drop reordering of recipient pills now supported


  • OpenPGP: Some signature states reported as “mismatch” now report “unknown”
  • Privacy policy now displayed in a tab when updated
  • Chat: Non-functional Twitter support removed


  • OpenPGP: Improvements to key importing when failures occur
  • OpenPGP: Decryption did not work with certain HTTP proxy configurations
  • OpenPGP: “Discover keys online” option did not work when searching for an email address
  • Email filters reported failure when moving a message to original folder
  • Message filters: Filters shown as enabled in configuration dialog were not always enabled
  • vCard 2.1 attachments not handled properly
  • Sending messages sometimes failed when recipients were in LDAP address book
  • Non-functional help menu items removed
  • Adding custom headers in the addressing widget (preference mail.compose.other.header) did not work
  • Calendar: Event reminder details were unreadable
  • Windows 10 high contrast theme fixes
  • More theme fixes and improvements

Known Issues:

  • Selecting “Cancel” on the Master Password prompt at startup incorrectly reports corrupted OpenPGP data.
  • Message list is not focused at startup

Version number 78.2.2
Release status Final
Operating systems Windows 7, Linux, macOS, Windows 8, Windows 10
Website Mozilla Foundation
License type GPL