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comment by Cedar

Ghostery definitely sells your data, I can't remember if it's under the settings or during install but they do tell the user that they do this. I believe Adblock Plus and uBlock (the old, non-open source one) do this too.

Problem is, some browsers do this too; I think Chrome has some DNS protection setting which intercepts your DNS requests and sends them on to Google... though to be fair many people use Google's DNS already hah.