Mozilla is enabling Total Cooke Protection (TCP) by default for all Firefox users worldwide.
Companies like to track us around the web whether we like it or not using cookies. TCP was introduced last year and prevents that by creating a separate "cookie jar" for each website you visit. The cookies activated by your visit are then trapped in their jar and unable to follow you to other websites.
Mozilla took this approach so that cookies can continue to work to "fulfill their less invasive use cases" such as allowing a website owner to see accurate analytics, while at the same time preventing tracking without users needing to rely on a third-party solution. It's also an improvement on Mozilla's Enhanced Tracking Protection (ETP), which launched in 2018, but relied on a maintained list and was easily thwarted. TCP doesn't require a list to work.
Another way companies keep track of us around the web is by using browser fingerprinting, but Firefox already has a solution for that with built-in fingerprinting blockers. With that and TCP turned on by default, it's much harder for anyone to keep tabs on you. And if you want even more protection, there's always Firefox add-ons such as Facebook Container.
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