7cent

Hi Sancy, Yahoo Powered search is an adware program, and request you to set Yahoo as your homepage and default search on all of your browsers. After a long search on the Internet I found this article that can resolved my issue. https://www.securemacos.com/single-post/2017/04/27/Remove-Yahoo-Powered-search-virus-pop-ups-from-Apple-Mac-OSX-macOS