tr.snapchat.com Popup Window
Occasionally three tabs will popup in Safari. One is tr.snapchat.com and the other two just say "tr". Then audio starts playing from a star trek episode. I know its star trek because it says "previously on star trek discover..." It cannot be turned off. I can force quit all of the running apps and it still plays. I checked the host file to see if it was there, but there is only three lines in the host file. I do not and have never visited snap chat. I also have not watched star trek discovery on my mac (or any other computer). This popup will happen randomly, not related to any specific website I am visiting. It will even popup when Safari is closed. The audio cannot be paused or turned down. The only way to get the audio to stop is to restart the computer.
Does anyone know what this thing is and how do I stop it from loading audio?