It works fine! Rated 5 out of 5 stars

There's probably a button available for anything one can think of to simplify the browser use and eliminate some extensions. The dev build 0.0.5.6 works perfectly well with Fx12, Fx13b. Get it here - http://custombuttons.mozdev.org/devbuilds.html

This review is for a previous version of the add-on (0.0.5.5).