I opened firefox and it looked like it briefly updated before starting. Home page of google news did not come up and the address bar was blank, as was the screen. I'll type a variety of web addresses into the address bar and it appears to accept them, but the screen never changes from being blank. When bookmarks are clicked, the current web address doesn't change, and the page remains blank. I had just started using a service to mask my ip address called unblock-us.com. This required me to disable Internet Protocol 6, and use a specific DNS server address in Internet Protocol 4. I had zero problems with firefox while doing this, but thought it might be relevant. I've reversed these changes but it has not changed the state of firefox.