Software Update: Mozilla Thunderbird 78.10.2

The Mozilla Foundation has released version 78.10.2 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, 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.


  • Added support for importing OpenPGP keys without a primary secret key
  • Add-ons manager displays a preferences icon for mail extensions that include an options page


  • OpenPGP messages with a high compression ratio (over 10x) could not be decrypted
  • Selected OpenPGP key was lost after opening the Key Properties dialog in Account Settings
  • Parsing some OpenPGP user IDs failed
  • Various improvements to OpenPGP partial encryption reminders
  • Troubleshooting information page did not display row labels on macOS
  • Mail toolbar buttons were too big when displaying both icons and text
  • Various security fixes

Version number 78.10.2
Release status Final
Operating systems Windows 7, Linux, macOS, Windows 8, Windows 10
Website Mozilla Foundation
License type Freeware/Paid