The site could be temporarily unavailable or too busy. Try again in a few
   moments.
 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."

At first I just got this message: '''''Exc in ev handl: Error: Bad NPObject as private data!''''' But everything still worked fine, I was able to search & still use the internet. Then I disabled the McAfee add-on, and the error stopped showing up. But then two days ago I got this new error: "Unable to connect Firefox can't establish a connection to the server at www.google.com.au The site could be temporarily unavailable or too busy. Try again in a few moments. 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." And now I can't use Firefox at ALL. Everytime I open firefox, I get that above error. I've tried a few things suggested, I've uninstalled and reinstalled, I have tried disabling all the add-ons I've restarted and checked the proxy settings, and I've made sure the firewall is ALLOWING firefox. Nothing has worked yet. Still can't use firefox. Its not my internet connection, because I'm currently using Internet Explorer, and its working fine.