I wrote a fairly long comment touching on why most browser and extension privacy features are just theatre and in reality tend to reduce privacy:
reddit.com/r/GrapheneOS/c
Services like Panopticlick are also incredibly misleading. Their approach is flawed and the data is tainted.
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Also gave a shout out to Apple for shipping some genuinely useful privacy features in Safari. There are not many attempts at browser privacy features that I can say that about. It's nearly all privacy theatre. Safari does that too, but they shipped a few genuinely good features.
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In general, extensions reduce privacy. Changing site-visible settings reduces privacy. Deviating from standard content filtering lists reduces privacy. If you use uBlock Origin and you deviate from the standard filters, that can be detected. Sites can enumerate what is blocked.
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I disagree with this take. There is "the site" and there is all the 3rd parties "invited" by "the site". Not connecting to the 3rd parties will significantly lower the data mined & sent to countless 3rd parties -- no way this is a reduction of privacy.
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That's a misinterpretation of what I said. I called it a useful, opportunistic privacy improvement falling into the same school as antivirus of enumerating badness. It's not a fundamental privacy improvement. Ultimately, it doesn't really work, and just targets low-hanging fruit.
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You said "in general extensions reduce privacy", I responded to this. And how do you know "it doesn't really work"? You have actual data supporting this? I see no references in your reddit post.
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The approach of enumerating badness fundamentally doesn't work. If you want to mislead users about what it achieves, that's on you. It's opportunistic elimination of low-hanging fruit. The same applies to heuristic-based measures. What's the fundamental privacy improvement? None.
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I explicitly said that features like content filtering and Safe Browsing are useful, but that fundamentally they aren't workable. They only target the low-hanging fruit on a case-by-case basis. Using heuristics is a step up, but ultimately still based on enumerating badness.