Wow, a browser is making network connections, how dare it. Come on, these things are there so that if you are on "connected" to a network that require some registration, e.g. an airport, then you can actually be forwarded to that registration page.
Like what do you even think, Mozilla people are sitting on top of all that sweet
PING www.mozilla.org (3.161.119.172) 56(84) bytes of data.
64 bytes from server-3-161-119-172.vie50.r.cloudfront.net (3.161.119.172): icmp_seq=1 ttl=248 time=4.06 ms
64 bytes from server-3-161-119-172.vie50.r.cloudfront.net (3.161.119.172): icmp_seq=2 ttl=248 time=4.16 ms
64 bytes from server-3-161-119-172.vie50.r.cloudfront.net (3.161.119.172): icmp_seq=3 ttl=248 time=3.64 ms
What the hell would they do with that?