There was a long thread here a while back in which someone used tcpdump to test many browsers for automatic connections. As I recall, all Firefox derivatives they tested, including Waterfox, made some automatic connections without user knowledge. At the time, I tested Abrowser and found the same thing. Shortly afterward, additional privacy features (the ones you see when you open a new tab) were added to Abrowser. I tested Abrowser again after the new features were added and found if you accept the default settings it does not make any automatic connections. Assuming nothing has changed with other browsers since then, Abrowser is the only Firefox derivative that does not by default make connections without user knowledge.
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