[greatgib]

So sad to see that the Mozilla corporation completely lost its way.

I'm wondering if they are really surprised to have almost lost all of their market share when they go against their core values so easily...

The tldr that says it all:

   One Mozilla developer claimed that explaining PPA would be too challenging, so they had to opt users in by default.

...

   The way it works is that individual browsers report their behavior to a data aggregation server (operated by Mozilla), then that server reports the aggregated data to an advertiser's server. The "advertising network" only receives aggregated data with differential privacy, but the aggregation server still knows the behavior of individual browsers!

[anticensor]

Yeah, why isn't the DP applied at the client side? It's not like a simple Gaussian shuffler is so computationally expensive.

[imajoredinecon]

The article’s description of the feature is very inaccurate. The way it works is using secure two-party computation to aggregate data and apply DP server-side without Mozilla or the advertiser being able to see pre-aggregation data.

This has much better utility than applying DP client-side but still has similar privacy guarantees

[greatgib]

All in all, I don't see why my own "privacy preserving" browser would snitch on me doing calls to an external server with aggregated data about my browsing history just to please advertisers...

Even if they pretend that data is "obfuscated" in some way...

[fsflover]

Because the advertisers wouldn't trust that?