QuickFolders is a Thunderbird extension which brings you Folder Tabs.
From the Project Website:
”[…] having your most important folders as tabs. Open folders and sub folders, move/copy mails without scrolling around or searching. […] To get a better idea of what the extension does, head on over to the screenshots section!”
Simply use the default installation method. See https://addons.mozilla.org/de/thunderbird/addon/3254 to get the
The QuickFolders website also provides detailed screenshots, showing interesting possibilities.