Pop up I can't get Rid of
I have a Pop up in new tab of Safari named "(1) Windows Firewall warning: YOUR COMPUTER HAS MALWARE/SPYWARE DETECTED" linked to "newsalert.report-o.com/bo/ca" and tells you to call a 1-800 number to fix it. It has no X to close it, only an OK at the bottom. Can't close from File menu, have to force quit/shut down but its still there.
MacBook Pro (13-inch Late 2011), iOS 8.1