The Mozilla Foundation, makers of the Firefox Web browser, made headlines earlier this year when it revealed plans to block third-party advertising cookies by default on Firefox 22. Apple’s Safari browser already blocks third-party cookies. Advertising trade groups like the Association of National Advertisers have blasted Mozilla’s cookie-blocking feature, describing it as "a dangerous and highly disturbing development."
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Jonathan Mayer, the privacy advocate and graduate student at Stanford University who designed the Firefox cookie-blocking feature, agreed, noting that Mozilla would need another release cycle to catch up on the measurements. “In particular, I'd like to improve our understanding of false positives (i.e. trusted third parties) and false negatives (e.g. untrusted first parties that are grandfathered in or that the user is temporarily redirected through),” Mayer wrote.
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