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Google Chrome pushes ahead with targeted ads based on your browser history
(www.theregister.com)
This is a most excellent place for technology news and articles.
I could not find it on Firefox without the: "about:profiles" that you mentioned, probably it's not easy to find, it's the first time I see it on Firefox. In Floorp is: Settings -> Profiles -> -Create, switch, config...
Oh, are you talking about mobile or desktop? I don't think it's possible on mobile...