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A Harvard University fellow has developed a browser extension that stops advertising networks from tracking a person's surfing habits, such as search queries and content they view on the Web. The extension, called Targeted Advertising Cookie Opt-Out (TACO), enables its users to opt out of 27 advertising networks that are employing behavioral advertising systems, wrote Christopher Soghoian, who developed it, on his Web site. Soghoian, a fellow at the Berkman Center for Internet and Society at Harvard and a doctoral candidate at Indiana University, modified a browser extension Google released under an Apache 2 open-source license. Google's opt-out plugin for Internet Explorer and Firefox blocks cookies delivered by its Doubleclick advertising network. A cookie is a small data file stored in a browser that can track a variety of information, such as Web sites visited and search queries, and transmit that information back to the entity that placed the cookie in the browser. Google's opt-out plugin comes as the company announced plans last week to target advertisements based on the sites people visit. Targeted advertising is seen as a way for advertisers to more precisely find potential customers as well as for Web site publishers to charge higher advertising rates. But the behavioral advertising technologies have raised concern over how consumers get enrolled in the programs, what data is being tracked and how the data is protected.