This is faster/lighter than its only "rival", DTD2, but it also undoes moving to a new window via right click, and moving to an existing window via drag-and-drop. I am used to working with multiple windows, which means I need to move tabs from one another often, and this is the reason I cannot use this add-on. All that being said, I cannot give this less than three starts, because it does what it says and it is lightweight.