Depending upon whether the page you are requesting has been fetched in the current session or a new tab requests the page the failure is either a timeout after much spinning of the hourglass equivalent or page not found message. It is like the DNS entry gets messed up somehow. I don't know if anything else fails to connect as I don't knowingly do anything else that accesses the internet outside of Firefox on that machine.
Rans6............
ps I don't have the machine to hand, it got left 250 miles away when we left last evening. We were trying to travel light.