Ghostery highlights the various advertising and demographic "trackers" which many websites run in the background, slowing loading as well as creating privacy concerns.
The newer versions of Firefox can do this through a menu setting, but I prefer the detail view Ghostery provides.
44 posted on 09/23/2015 5:26:34 AM PDT by Eric Pode of Croydon
(Call me a "Free Traitor" if it amuses you. It will only strengthen my resolve.)