I got a weird warning while playing a FB game tonight. It opened a new tab in Firefox & started playing an audio message telling me to call this number. One message states: WARNING: Customer - Your browser and computer may be compromised by security threats. Call 1-877-679-2144 now for IMMEDIATE assistance. There's a web page behind that pop up message. it's (malware alert dot org slash warning dot html). How do we get this to stop? Is it a virus? I scanned with AVG & it didn't pick anything up.