Rated 5 out of 5 stars
Works as advertised. As an extra feature could you add middle click anywhere on page to close tab (except when middle clicking on links).
Edit: That was quick, went over there and grabbed it, couldn't wait. :) Thanks a lot mate, works flawlessly.
Update: I've done it last night and uploaded it to Babelzilla for translation. Once that's done I'll release the final version, and AMO will release it after reviewing. It could take quite a while. If you don't want to wait, you can download it from Babelzilla directly though (it'd be the 'middle click' translation possibly unfinished, AMO unreviewed version there).