Rated 3 out of 5 stars

I used to rely on this. That theater thing is so-o-o awful!Now I can echo exactly what user MrEd has written: "Just within the last few days there was an update to something, Java I believe. This caused FF to start throwing out the error
"Error: Illegal operation on WrappedNative prototype object."
Fix? Quick? (P.S. I have FF 22.0.)
Post revised, 6July2013: Have been testing new version 1.2, linked by developer below. At first it seemed fine again. But now accessing a FB comment via the globe icon at the top of the FB page generates this other error:

"Error: document.body is null"

Thanks for working on it!

Hi, Sorry for the trouble. The new updated version 1.2 has been submitted for review.