Ughh, Ghostery isn't FLOSS, but that does not make the code invisible, many places where you can see it like: https://addons.mozilla.org/en-US/firefox/addon/ghostery/vers... or ghostery.com/ghosteries/chrome/

And there is this: http://www.areweprivateyet.com

I use disconnect too, after I found that Ghostery had some weird clashes with other plugins. CPU thrashing around at 100% for minutes kinda clashes :(

For reference, I actually use Disconnect and Ghostery and DoNotTrackMe and NoScript and RequestPolicy.