So… hopefully a persistent option setting
The new feature, called Tracking Protection, would rely on lists that users create that indicate which sites they do not want to share information with. Lists can be created by individuals or by organizations, like consumer advocacy groups, which can make their lists available for anyone to use.
Once enabled, the tracking protection would exist for all Web pages the user visits and would take effect each time they start a new browsing session. The mechanism would identify and block third parties from collecting data through cookies and other mechanisms that track users.