Mozilla, acting on a U.S. Federal Trade Commission proposal, has offered a detailed mechanism by which Firefox and other Web browsers could prevent Web pages from tracking people’s online behavior for advertising purposes.
With Mozilla’s do-not-track technology, network data packets from the browser would signal to a Web site that a person doesn’t wished to be tracked. Then comes the tricky part: getting Web site operators to cooperate.
Alex Fowler, Mozilla’s global privacy and public policy leader, said that with the mechanism, the browser would alert a Web site during basic communications that use the Web’s Hypertext Transfer Protocol (HTTP). He also acknowledged that getting Web sites to cooperate is a crucial difficulty in getting the system to work:
As the first of many steps, we are proposing a feature that allows users to set a browser preference that will broadcast their desire to opt-out of third party, advertising-based tracking by transmitting a Do Not Track HTTP header with every click or page view in Firefox. When the feature is enabled and users turn it on, Web sites will be told by Firefox that a user would like to opt-out of OBA [online behavioral advertising]. We believe the header-based approach has the potential to be better for the Web in the long run because it is a clearer and more universal opt-out mechanism than cookies or blacklists…
The advantages to the header technique are that it is less complex and simple to locate and use, it is more persistent than cookie-based solutions, and it doesn’t rely on user’s finding and loading lists of ad networks and advertisers to work…
The challenge with adding this to the header is that it requires both browsers and sites to implement it to be fully effective. Mozilla recognizes the chicken and egg problem and we are taking the step of proposing that this feature be considered for upcoming releases of Firefox.
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