This does not prevent regular ad tracking, this provides additional data to advertisers. It also means Mozilla is now tracking me, and then Mozilla does this “anonymizing” on their servers. I do not trust Mozilla with this data, and I don’t trust that no way can be found de-anonymize or combine this data with other data ad networks already collect.
This is not in my interest at all. This data should not be collected. The ad networks can suck it, why should I help them?