So, my mac has an extension that's keeping me from searching on webpages, instead pop up a yahoo search every time I try to type something on any search box. I've been following the directions to Turn off or uninstall extensions but doesn't work

 1. There is adware installed on your Mac.

     Use  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.

2. Additional steps to take, if necessary.

  1. Remove unknown profiles.

     System Preferences > Profiles

      Open System Preferences, click the “Profiles” icon ( a checkmark on a gear) .

      When Profiles pane opens, select the unknown profile and click the minus button at the bottom.

  2. Remove unknown Login item.

       System Preferences > Users & Groups > Login items

       Authenticate and unlock the lock.

       Highlight the unknown login item (Mac Mechanic?) and click the “-“ button at the bottom left to remove it.   

  3. Remove unknown extensions:  Safari > Preferences > Extensions

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

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

      Change Home Page

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

   6. Ref: https://forums.malwarebytes.com/topic/236261-how-to-remove-weknow-malware-and-others/

   7. Shutdown the computer from  menu. Start your Mac using the Power button.