I Run Windows 7 Ultimate. I use Avast anti Virus. Google Chrome works fine. Firefox started not responding to searches queries from its default home page. When I input an address in the address line i also had no reaction. When i clicked om a bookmark it does load that particular website. I have uninstalled firefox completely. Reloaded the latest version downloaded from Mozilla. Still have the same problem. I did a Reset Firefox. No luck. I changed the proxy settings to "no proxy". I have done the "disable IPv6" in about:config. I have created the "network.dns.disablePrefetch" boolean. Still no luck. Please help.