Of course, there are use cases where user wants to be recognized as he travels across web domains. For example single sign on, or a chat with a company represe

Of course, there are use cases where user wants to be recognized as he travels across web domains. For example single sign on, or a chat with a company representive when the company has several domains. This "tracking" just needs to be clearly visible and controllable by the user. It would be good if web browsers had a mode, where every time a site is trying to access cross domain cookies, a confirmation dialog was shown with details of the data requested, how the site is going to use it, their privacy policy. With options Allow once, always, 3 days, etc.