good, a couple flaws Rated 4 out of 5 stars

I love this extension for the way I can change long black print on white background articles and other readibles to grey text on black background. It's much easier on my eyes. For text size buttons I reccomend the toolbar buttons extension instead because this one is three button spaces wide and requires you to have al three on the bar at once. Also, when you use tabs, changing one tab's template causes the others to also change once they are refreshed. All in all, i find it very useful

This review is for a previous version of the add-on (0.7.4).