Frequently recently, when I have clicked on a web link in Facebook, it gets hijacked and I get sent to a page in Chrome with stubborn pop-ups that try to make me download malware. I can't remember all the details of these pages, but one was a fake Google page and another that comes up frequently has "navalwinner" in the url. The links in Facebook that I click on that lead me to these sites are usually for respectable sites that I have visited many times in the past without problem. How can I stop these hijackings?