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I certainly can't offer any official word, but telemetry doesn't have enough data to spy on anyone, and the privacy policy spells this out pretty clearly. And if something snuck in, it's all open source and I imagine people would raise a big stink pretty quickly (whatever their political leanings were).

I remember that post, and I think you're mischaracterizing it. The point wasn't that "deplatforming is a good start, but we need to go even farther"; it was "deplatforming is not the right solution, we need something better".

As for trying to block harmful content -- Mozilla is already doing that, all the time, so you're certainly not going to get any promise there. Firefox blocks malware, sites with expired/mismatching certificates, things on the (un)safe browsing list, 3rd party cookies in some configurations, etc. Whether any of those constitute censorship is up for you to decide. Right now, it feels fine to me, but I agree that there's reason for concern. All the browsers have all the mechanisms necessary for censorship, and there's no way to crisply define "harmful".