I get the following message when i open firefox, please help me with the solution:server not found.firefox can't find the server at www.yahoo.com check the address for typing errors such as ww.example.com instead of www.example.com if you are unable to load any pages, check your computer's network connection if your computer or network is protected by a firewall or proxy,make sure that firefox is permitted to access the web. NB: my network is connected properly and the spelling for the URL is correct, please what could be the cause and how do i solve it.i have tried everything i could.