Cookie filter and block for Firefox?

I use Firefox's Adblock and Filterset.G.Updater extensions to ditch the advert pollution on many pages of the interweb. What we really need is a decent CookieBlock and CookieFilterset updater, the sort that blocks cookies like urchin I blogged about before. Is it that because cookies aren't visible they're not annoying enough to start blocking the unique trackers on pages? Should have been available before now, so as Mozilla guys aren't implementing as a core feature I hope someone will scratch the itch as an extension ;)