Rated 3 out of 5 stars
Very useful when selecting a tab from those currently available, but very awkward when wishing to close one or more -- each must be selected , opened on screen, then close individually. Much better to have the common close button at the end of the link title (I would prefer at the left end so the close buttons line up instead of having to mouse to the far right of each tab name -- or a [Ctrl]+LClick to select several tabs, then press [Delete] or RClick/Delete to close them).
Additionally, it would be nice to have the tabs displayed as a tree to show which are children of an earlier tab.
But, this is a nice add-on nonetheless.