This application allows you to put contents onto separate tabs.
Tabs accept any kinds of contents.
To create new tabs, click the icon of the tab container to open its contextmenu, and select "New tab".
To sort the tabs, just grab their icons and drop them to the desired location.
You can drop tabs across tab containers.
Notice that this content is deeply nested within 3 tab containers. You probably don't want to use it this way, yet it is supported nevertheless.