Server not found at Firefox , Google Chorm Windows 7

Server not found       
          Firefox can't find the server at www.firefox.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.

When you got this message from your browser please restart your pc and ry again. Happy netting....