On your device: "Interests: Candles, Wooden Sculptures, Underwater Basket Weaving"
Advertiser: "Show this to users who like Candles."
Mozilla: "OK"
That's pretty standard and can be used to track people on the advertiser's side still, depending on how the ad itself is served and how clicks on the ad are processed.
I haven't been able to find any documentation of this, other than "we acquired Anonym, which claims to send the data to trusted execution environments".
Advertiser: "Show this to users who like Candles."
Mozilla: "OK"
That's pretty standard and can be used to track people on the advertiser's side still, depending on how the ad itself is served and how clicks on the ad are processed.