lol, there were no answers when I was typing the original answer
so, theres the code
I could be wrong, but:
Most (I think) ISPs provide you with a dynamic ip address - one that is subject to being changed.
If your machine is set to get its IP address by DHCP, then I think that the machine will have already tried to get an address, failed, and given up during the boot.
erm.. I think that that is correct; no doubt I will be corrected by someone with more knowledge if this is not the case.
as for mozilla closing, sorry... I have no idea