It's useful, I just wish it didn't insist on popping the box up on top of the UR's unless I make sure to move them to the upper left portion of the screen. I don't need to open the UR's in another tab, I just need to be able to click on and open the UR and the pop-up box trying to cover the UR's gets annoying quickly.
Not sure, but there may be a bad interaction between this script and the latest WME version. With this extension enabled scrolling is far too fast. Disabling the script seems to resolve the problem. Obviously this is far too an important script to miss out on for too long!