I did exactly as you said. But the problem is still there.
Let me put it in other words "the websites I've talked about do not load. I appears they will take forever to load and I don't see any webpage. Only the Firefox waiting sign I see."
It doesn't seem to be a problem with the internet as I can access other websites including UbuntuForums.
I am grateful to you for your assistance but I think I will need another solution. That one didn't work.