All the bad features of the Chrome version, none of the good ones of the old Firefox version. Blocking elements rarely works, adding custom filters is a giant pain, there's no way to see blockable elements, etc. etc. I understand having to push out an unready version that's compatible with Mozilla Chrome (let's face it, that's what Mozilla is basically doing, taking away the features that made Firefox useful where Chrome wasn't), but this really isn't a match for previous functionality yet.