The Ghostery plugin which is available for Google Chrome users allows the users to defend themselves against trackers and identities which want to gain personal information from your browser. The plugin can be installed via the chrome.google.com/webstore and it is completely free.
The complete file is just 1.15MB and it is also capable of stopping annoying advertisements. It is currently being used by 1.9 MILLION users and it is still updated monthly with the latest updates and patches.
I strongly recommend everyone to use the free Ghostery plugin which adds another security layer to your browser and computer.