A necessary accessory to anyone traversing the world wide web safely. My compliments to the developers; this add-on is quite affective.

Extension seems broken, source code isn't available, and results are wildly inconsistent. It's useful if you don't want to get to know people by talking to them, but the notion of crafting a master list of bigots based on anonymous reports is kind of iffy

Must have add-on

really useful add-ons does not work over add-ons that change the aesthetic of a page (youtube enhancer at least)