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- Firefox's "Privacy-preserving" ad tracking has other interesting issues. In another way the new ad snitching is worse than the old tracker cookies, Firefox doesn't *tell* you what data it's collected or reported, and unlike with cookies doesn't give you the ability to delete recorded "impressions".

Also interestingly, the feature is not available to *all* advertisers currently, only a "small number" of partner sites. *Firefox doesn't disclose who they are*, again making this worse than $GOOG.