Collusion works on Firefox even though the article leaves the impression that it doesn't.
Here's an article comparing Do Not Track Plus to Ghostery
http://www.digitaltrends.com/web/do-...s-vs-ghostery/
I have 3 browsers (Firefox, Chrome and IE9) and am currently running Do Not Track Plus, Ghostery and Collusion on all 3.
So far I favor Do Not Track Plus, followed by Ghostery.
Roger P