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People wait to attend a Mozilla press conference in Barcelona, Spain, in February. Mozilla's Firefox and other Web browsers allow users to opt out of third-party tracking cookies.
Josep Lago/AFP/Getty Images
July 2, 2013 The recent revelations about the National Security Agency's Internet surveillance have breathed new life into a basic question: How do you hide online? There are some things you can do to cover your tracks, and privacy advocates are working on even better tools for staying anonymous. But that worries advertisers.
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