Nobody believes that.

I would replace that “aggregated and anonymized” with an and/or, as that is consistent with the language in Mozilla’s privacy policy. The distinction is fairly important because de-anonymizing user data is a practice of its own and exactly what it sounds like.

Now, is the data which Mozilla “shares with” (sells to) its partners anonymized reliably enough that the identity of the person it relates to can never be rediscovered? Granting Mozilla the benefit of the doubt, if it is sufficiently anonymous today, could future developments lead to de-anonymization of that data at a later date? This could include leaks, cyber-attacks directed at Mozilla, AI-assisted statistical analysis of bulk data, etc.

In an aggregated and anonymized manner

Phew, what a relief, that puts my concerns about powerful actors abusing that aggregated data fully to rest!

Just like Google