Ghostery , an extension available for all browsers.Incidentally, anyone with this extension in your browser may block tracking cookies in a personalized way, so it's a staple that should be always on if you want to be aware and jealous of your privacy .
Is even more comprehensive extension to Firefox Web developer , showing detailed pages of active cookies and information about them.
started for almost two years , in early 2011, when he joined Automattic Quantcast tracking statistics in your plugin , formerly WordPress.com Stats plugin and now part of JetPack. This means that if you have a website or use WordPress.com stats module JetPack're carrying a cookie ( _qca ) that gathers information from your visitors and, as reported by Quantcast , someone is sharing with others .
But then I do what I can to meet Automattic this failure?
There are several things you can do:
Use some form of notice of cookies in WordPress .
Install the plugin DoNotTrack , which prevents your plugins created or saved codes and cookies of your visitors.
... And encourage your readers to install Ghostery.
And I can think of some more.