I don't know. I just suppose that it's not that simple. It is never a good idea to assume something is safe for good. The TTL of the packet could also be used m

I don't know. I just suppose that it's not that simple. It is never a good idea to assume something is safe for good. The TTL of the packet could also be used maybe? Also, there are also many people that are not behind a NAT. I've always had a public IP address at home, for example. Plus NAT may become less used because insert rant about NAT and IPv6. Anyway, it's good that browsers make all they can to ensure privacy :).