Mozilla postponed block third-party cookies by default in Firefox 22, "to collect and analyze data on the effect of blocking some third-party cookies. "
Mozilla has tested a patch of Jonathan Mayer, a graduate student at Stanford University in computer science and law and online privacy activist who such as Apple's Safari browser allows cookies from previously visited websites, but blocks cookies from unvisited sites.
A pre-release version of the browser, called Firefox Aurora, was released on April 5, and included the patch to only allow cookies from sites visited. The plan by Mozilla to block third-party cookies by default in Firefox versions to come has been criticized by the online advertising industry.
Mozilla is now worried "false positives", as if the web cookies patch blocks associated with a site that the user has visited. On the other hand, just because a user visited a Web site, it may not be comfortable being followed all over the Internet and on independent sites, which is a "false negative" that the patch would allow
Source .: PC Advisor
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