You will have t do this after starting up in Safe Mode to prevent adware
from interfering with the removal of adware .
1. Shut down the computer.
Press the power button. Immediately after you hear the startup sound,
press and hold the Shift key.
The Shift key should be pressed as soon as possible after startup,
but not before the startup sound.
Release the Shift key when you see the Apple logo on the screen.
Startup will take longer than usual.
Screen flickering is normal in Safe Mode.
Login to your account. Launch Safari.
Enter this address https://www.malwarebytes.org/antimalware/mac/
in the Safari address bar.
Download, Install , open, and run it by clicking “Scan” button to remove adware, if present.
Once done, quit MalwareBytes.
2. Safari > Preferences > Extensions
Turn all extensions off
or uninstall all extensions you haven’t installed knowingly.
3. Safari > Preferences > Search > Search Engine :
Select your preferred search engine.
4. Safari > Preferences > General > Homepage:
Set your Homepage.
5. Restart normally using the “Restart” button.