someone has already gone "technically it's not targeting", which doesn't really address the whole "this is a breach of trust" thing
and well, forgive me for using "targeting" as a short hand for "measuring ad impact rates by surveillance of users, so that advertisers can minmax their advert spend", but again, it doesn't matter
as that's how users perceive a black box in the browser collecting statistics for advertisers to maximise their click through rates-especially the users firefox has