R.I.P. Scout26
Collusion is an experimental add-on for Firefox and allows you, for the first time, to see all the third parties that are tracking your movements across the Web. It will show, in real time, how that data creates a spider-web of interaction between companies and other trackers.
I tried it. Fascinating to say the least. Not something I'd want to run all the time. It uses a hunk of processor time when active.
I ended up using adblocker to cut off as many as I could from the websites I routinely visit...