I've been messing around with it in Firefox all evening and it works like a charm - except that, being a bit shakey at times, it would be annoying to have the pop-up open just because I moved the cursor arrow over it, as mentioned before.

I think I really like it, Max. I've been going from thread to thread and highlighting song titles, then going to videos. Hearing lots of music and songs I do not know that I otherwise would probably not have the time to go search out otherwise.