![]() ![]() ![]() Most modern web browsers contain privacy settings that can block third-party cookies.Ī "supercookie" is a cookie with an origin of a Top-Level Domain (such as. On average, a single website was setting 10 cookies, with a maximum number of cookies (first- and third-party) reaching over 800. The advertiser can then use these cookies to build up a browsing history of the user across all the websites that have ads from this advertiser.Īs of 2014, some websites were setting cookies readable for over 100 third-party domains. Eventually, both of these cookies will be sent to the advertiser when loading their advertisements or visiting their website. Then, the user visits another website, Foo.com, which also contains an advertisement from ad./, and which also sets a cookie belonging to that domain (ad.). This web site contains an advertisement from ad., which, when downloaded, sets a cookie belonging to the advertisements's domain (ad.). ![]() This opens up the potential for tracking the user's browsing history, and is often used by advertisers in an effort to serve relevant advertisements to each user.Īs an example, suppose a user visits Example Domain. These sorts of cookies typically appear when web pages feature content, such as banner advertisements, from external websites. Third-party cookies belong to domains different from the one shown in the address bar. ![]()
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