My MacBook Air was infected Safari via a Flash update. There are just so many of them, the Flash update requests, that after a while I give in and update. This one happened on Sunday 10-20-2019.I have tried the various fixes and am ready to go to Apple/Genius Bar and get a pro to help me. I have a vaguely Goole-ish search page , "Simple Search"
. I can't get rid of it. BOO!