google is block in some country. so make sure you are not the citizen of those countries. 2nd, some net admin of some organization will block google for some unsung excuse. so make sure not their reasons. 3rd, if you really could properly get into google days before, try to use "nslookup" to test www.google.com, if it cannot reply a proper ip version 4 address, then it is not the problem of firefox, it is your network connection or networking setting-up problem. so you need a network-engineer-alike buddy to help you. and how to use nslookup, if you can surf online, try another search engine like yahoo.com to get detailed usage of it. good luck buddy.