Yahoo hijacking browsers
Recently noticed that Yahoo has hijacked the search engine function on both Safari and Chrome. Went thru routines on Chrome to reset to Google, but it reverts back to Yahoo. On Safari, the Google search option cannot be chosen, and Yahoo is frozen as the choice. Tried free malware cleaner, but to no avail.
Very frustrating that an inferior search engine has hijacked a superior. Please kindly advise.
Mac Pro, macOS 10.13