I use firefox with quite some plugins (just to name a few: noscript, facebook container, blur, disconnect, cookie autodelete, duckduckgo privacy essentials). I know some sites require offsite scripts which i block (especially everything i can link to google or facebook) what may make some sites quite unusable (i don't miss them though), others use cookies which get deleted the second i leave the domain (or not even be created when it gets identified as tracking cookie) and there are other potential problems.