I used to have a whole slew of privacy plugins installed including AdBlock Plus, Ghostery, and several others, but I ended up removing them all and now I just stick with the regular AdBlock plugin. They were causing too many web sites to "break" and not function properly. Also, I believe the creators of AdBlock plus have been taking payouts from Google and other ad networks, to let their ads through, which kind of defeats the purpose of the plugin itself. They were also slowing the browser down, Ghostery in particular, because they're all scanning through any given web page for stuff to block, causing the pages to render more slowly. What I'm really looking for though is a plugin to block all these annoying popover overlays that practically every web site has these days, nagging you to sign up for their newsletters and other crap.