This is a helper addon for the Tree Style Tab 3.4.0 and later, and depends on the Tab Extra Contents API introduced at TST 3.4.0. If you use TST mainly for grouping tabs for each task, you may be suffered from too much collapsing/expanding trees on switching tasks. This helper addons provides small tab on a collapsed tree, it allows you to access the last active tab in the tree directly without expanding the tree.