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I know that it has that in theory, but my Firefox just reached a lower score on https://coveryourtracks.eff.org/ (which was posted in this threat, thanks!) than a Safari. Firefox has good tracking protection but has an absolute unique fingerprint, was 100% identifiable as the first on the site, as to Safari, which scored a bit less in tracking but had a not unique fingerprint.
I get that some things like screen resolution and basic stuff is needed, however most websites don’t need to know how many ram I have, or which CPU I use and so on. I would wish for an opt-in on this topics: So only make the bare minimum available and ask the user, when more is needed. For example playing games in the browser, for that case it could be useful to know how much ram is available, however for most other things it is not.