Large icon Rated 3 out of 5 stars
To make the icons normally-sized, remove the large icons in the chrome/skin/ folder and replace them with the small icons. The behavior seems to be a bug, rather than an intentional design decision.
The "undo last closed tab" context menu entry is useless and ought to be removed entirely, not just as an option.
It would be great if someone forked the extension, since the original developer doesn't seem to be active any more.