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Mozilla has rolled out a privacy protection it calls “Total Cookie Protection” as the default for the browser on Windows, Mac and Linux.
The idea behind Total Cookie Protection is that cookies remain limited to the site from which they were added to a browser. Mozilla’s analogy for the functionality of Total Cookie Protection is a “cookie jar”, which is assigned exclusively to the site that dropped the cookie file in the browser. No other site can access that assigned cookie jar, fencing cookies in to give advertisers a limited view of site visitors rather than a detailed multi-site view of them.
This aims to thwart cross-site tracking, which happens when a website or third-party content embedded on websites (such as Facebook “Like” buttons) drop a cookie into a browser that can be read by advertisers on other sites the user visits in future.
“If you visit Facebook, Facebook won’t be able to view your activity on Etsy, One Medical or your cousin’s cooking blog later,” Mozilla explains on a support page for Total Cookie Protection.
Mozilla argues this makes Firefox “the most private and secure” of the major browsers.
“Total Cookie Protection works by creating a separate “cookie