One of the biggest benefits of a tree of tabs is that it makes it easy to get rid of a group of them. You can double click a root tab to collapse its tree -- th

One of the biggest benefits of a tree of tabs is that it makes it easy to get rid of a group of them. You can double click a root tab to collapse its tree -- that's super useful right there; when you then close the root tab, all the tabs in the tree are closed, too. Makes it incredibly quick and painless to clean up after a prolonged research session, which in turn encourages judiciously opening tabs during research.