My tablet is open use for some family and friends. I am getting an automatic download in my notification bar for xvideos.com followed by a bunch of alphanumeric characters.  In my initial research I found out this is a porn site. I cannot find these files on my tablet nor can I stop them from being downloaded.  How do I get rid of this (outside of not letting friends use the tablet, the obvious).

THANK YOU!!!

Kuda