This is an extension for Firefox, Chrome and other browsers which lets you see what the sites you are visiting are doing in the background. Those sites come into our computers and not only install tracking cookies but also sometimes malware and other unmentionables in our computers.
Ghostery gives you that information in real time and makes you aware of what’s going on behind the scenes. This is what they have to say:
“Ghostery is your window into the invisible web – tags, web bugs, pixels and beacons that are included on web pages in order to get an idea of your online behavior.
Ghostery tracks the trackers and gives you a roll-call of the ad networks, behavioral data providers, web publishers, and other companies interested in your activity.”