Since three days "Connection has timed out" is showing up every few min for any site I visit and then it's gone and I can access the sites. I have tried everything described in Mozilla support about this issue like deleting entire browser history and cookies, flushing DNS, uninstalling / removing add-ons, refreshing Firefox, uninstalling and then reinstalling Firefox, etc. but nothing worked at all and now even after formatting my system the error is still there. Everything was working fine before and this is happening in my pc only. In laptop I can access any site anytime without an issue. Please help me.