Mogobiggy

   1. Uninstall unknown extensions.

       Safari > Preferences > Extensions

       Section: Manage extensions:

       https://support.apple.com/guide/safari/use-safari-extensions-sfri32508/mac

   2. Run  the latest release of Malwarebytes for Mac to remove malware/adware, if installed on your Mac.

       For instructions:  Install Malwarebytes for Mac          Uninstall Malwarebytes for Mac

       Click the “Scan Now” button. Once done, quit Malwarebytes for Mac.

       Restart the computer and relaunch Safari holding the shift key down.

Repeat the scan.

3. Reset search engine:    https://support.apple.com/guide/safari/customize-your-search-ibrwe75c2a3c/mac

4. Reset  Homepage.   https://support.apple.com/guide/safari/set-your-homepage-ibrw1020/mac