"Traditionally, your browser treats cookies like a single, massive community bucket. If you visit Facebook, they drop a cookie in the bucket. If you then visit a completely unrelated tech site that uses Facebook's tracking pixels, Facebook can reach into that shared bucket, see the cookie they left there earlier, and recognize you. They now know you like those AirPods and link that data to your profile. Now, multiply this by thousands of data brokers, and you have the modern surveillance economy."
"Now, multiply this by thousands of data brokers, and you have the modern surveillance economy. Firefox's Total Cookie Protection changes the physics of the browser. Instead of one big bucket, Firefox creates a separate, sealed "cookie jar" for every single website you visit. The specific name for this is State Partitioning, and it basically means that the browser isolates cookies rather than letting them cross-pollinate across every website."
Third-party cookies tag browsers and enable trackers to follow users across multiple websites, building detailed profiles and driving targeted advertising. Browsers traditionally share a single cookie store that lets trackers placed on different sites recognize the same user. Total Cookie Protection changes that model by creating a separate cookie jar for every visited website, a technique called State Partitioning. Isolating cookies prevents cross-site access by third-party trackers, curbs profiling and ad targeting, and reduces the influence of data brokers and the surveillance economy while generally preserving normal site functionality.
Read at MUO
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