My web proider is Verizon Fios. I've contacted Verizon 4 times about this. I was instructed to delete Firefox and then download again. It didn't help. I'm able to get to your main window. Then, when I try to go to any website, the following window comes up: "The proxy server is refusing connections. Firefox is configured to use a proxy server that is refusing connections. It tells me to "Check the proxy settings to make sure that they are correct." I tried that w/ my Verizon support person but how is one to know what "settings" are "correct"? Finally the window instructs: "Contact your network administrator to make sure the proxy server is working." Who would my "network administrator" be? It wasn't Verizon as they told me they don't support Mozilla.