According to Mozilla, Firefox's implementation uses the "Distributed Aggregation Protocol" (DAP). Individual browsers report their behaviour to a data aggregation server, which in turn reports aggregate data to an advertiser's server using differential privacy. But the aggregation server still knows the behavior of individual browsers, so basically it's a semantic trick to claim the advertiser can't infer the behaviour of individual users by defining part of the advertising network to not be the advertiser.
!chuds if you're not using Brave you don't belong in this ping group
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It wasn't checked by default, is r-slurred.
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It was, although maybe they changed it in the weeks since I posted this
https://support.mozilla.org/en-US/kb/privacy-preserving-attribution
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