Thunderbird 78 is a major release, not only the version number that has been aligned with the latest Firefox 78 web browser, but Thunderbird 78 also inherits the minimum runtime requirements on Linux systems, which include GTK 3.14, Glibc 2.17, and libstdc++ 4.8.1. The big new features of the Mozilla Thunderbird 78 release include a new Account Hub for centralized account setup, a new Delete action column in thread pane, the ability to use custom colors for the Folder Pane icons, as well as direct message (DM) support for Matrix.