Rated 4 out of 5 stars

Works like a charm in Seamonkey 2.1b2. :-)

Would be nice to see the icon on the right in the Statusbar like Greasemonkey has. (Greasemonkey, Stylish, AdBlock Plus etc.)
Adding the Button to the other bars via customize is possible but not for the Statusbar in Seamonkey it seems.

This review is for a previous version of the add-on (0.1b9).