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It's automatic. So if you open Facebook, or any Meta site, it automatically puts it in it's own container.

Together with Privacy Badger, Meta has no clue what you're doing on the rest of the web.

But MAC does that, too, if you create a "Facebook" container.

But I think you have to add every Meta domain into that container manually. The other one sounds like it's got them all already put into their own container. Convenient if you one day decide to set up an account on Instagram but never used it before, and forget to add it to the container.

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