GPT summarize:

Mozilla's latest update on Privacy-Preserving Attribution (PPA) discusses its testing phase in Firefox, focusing on privacy in digital advertising. The prototype allows aggregated ad measurement without revealing individual user data, using cryptographic techniques and partnerships with entities like ISRG and Fastly. PPA aligns with privacy laws like GDPR and is being tested in controlled environments, such as ads for Mozilla VPN on the Mozilla Developer Network (MDN). Mozilla aims to refine PPA through feedback and expand testing while ensuring transparency and collaboration.