Not working at all (OS X - FF 3.6.16) Rated 4 out of 5 stars
It's a quite nice and useful add-ons I've used sometimes with FF 3.6.14. But now after update FF to 3.6.16 this add-ons stops working : ( ... Actually I don't know if the problem is about 3.6.16 or what else. I just guess it. In short nothing happens pressing the "scan" button.
I could try to update FF to 4.0 and see if this fix it. But unfortunately for the moment FF 4.0 has troubles with some other add-ons I use.