Used Ghostery on Chrome and continued using it when I migrated to Firefox. Only issue between going from Chrome to Firefox is that the drop down info box is cut off and I cannot see the full info box on Simple or Detailed View. I like to see exactly what trackers have been identified and toggle which I want blocked or not, so that has been the only issue making me prefer the Chrome extension over the Firefox extension. I don't know why the info box is cut off, but it doesn't seem to be an issue associated with the theme I'm using.

Edit: turns out friend had similar problem; if the Ghostery icon is moved to the overflow menu then it can't display properly. I don't like having a busy toolbar so I'd prefer to keep it in the overflow menu, but this is not a dealbreaker.