I agree that this is a huge breath of fresh air because you are (1) actually reading what Mozilla said and (2) making sober nuanced distinctions absent from mos

I agree that this is a huge breath of fresh air because you are (1) actually reading what Mozilla said and (2) making sober nuanced distinctions absent from most criticisms. But that said, these reassurances run into a "who ordered that" problem. No advocate for privacy was ever advocating on behalf of anonymized data any more than personally identifying data. Anonymous averaging over interests of groups still involves privacy compromises; and metrics, fingerprints and learning algorithms can mix and match that in ways that still cross the line. Abstracted profiling still works, and digs deeper than you might suspect (I recall the netflix data that could predict interests across different categories, like people watching House of Cards also liking It's Always Sunny in Philadelphia). Preferences can hang together in a measurable way, which is exactly why ad companies want them. It's also just part of the long slow, death by one thousand cuts transformation into a company that doesn't have categorical commitments to privacy.