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by waterhouse 4042 days ago
Just as a little question, are all the ads pre-downloaded, or could someone theoretically observe which ads your browser downloaded and deduce things about your history therefrom?
1 comments

It downloads the same set of ads for everyone in the same country, then picks which of those ads to show based on local analysis.

https://blog.mozilla.org/advancingcontent/files/2015/05/How-...

Hoho, that's excelllent. That looks like it could actually be real privacy for anyone who doesn't click the ads.