I am running both Safari and Chrome on a MacBook Pro. OS is High Sierra 10.13.6. I picked up weknow.ac when I downloaded an update to Flash Player. I was able to get control of my Safari search engine page by going into Sys Pref> Profiles and deleting the malicious profile. However, I cannot seem to get it off my Chrome browser. I have tried everything I have found on line, including deleting Chrome and reloading it. The weknow.ac search engine came right back up. I did make changes to get a Google.com search engine when I first open Chrome, but when I open a second tab, it goes to weknow.ac. Any suggestions?