Mozilla Thunderbird 136 Released with New “Appearance” Panel in Settings
The biggest new feature of the Mozilla Thunderbird 136 release is a new “Appearance” panel in settings that lets you globally control message threading and sorting order. You’ll be able to define the default sorting and threading options for newly created folders from Unthreaded, Threaded (default), and Grouped by Sort.
Mozilla Thunderbird 136 also adds a toggle in the header to make messages automatically adapt to dark mode, changes the criteria for closing idle message databases, improves support for HiDPI screens, and improves the performance for users with many folders when resizing message panes.