Have you read it? They're saying that some websites use them for purposes that are not privacy concerns. As long as Google doesn't do this - by which I mean, as long as they only use third-party cookies for tracking - they're irrelevant, because Mozilla would shut them down anyway.
It's only sleazy if you see it as an attack and not a simple explanation.
It's only sleazy if you see it as an attack and not a simple explanation.