From the LaunchPad open Activity Monitor.

How do I get rid of adware on my Mac for free?

You can’t access personal files and see a ransom/fine/warning note.

Your browser has a new homepage or extensions you haven’t added.

You receive security alerts without scanning your Mac.

That said, Malwarebytes AdwCleaner can’t block adware from getting onto your computer to begin with. If you think you have adware on your computer, try downloading Malwarebytes AdwCleaner and running a scan. Malwarebytes AdwCleaner removes adware and spyware, which are types of malware. In the Finder, you’ll need to go to the Go menu and select Go to Folder, or hit Shift-Command-G. Search for these files and root out any malware. You’ll need to quit Safari or Chrome, then start checking your system for specific files known to be adware. ESET Smart Security for Macs works great.

Additionally, ADWCleaner for Macs works too… Helps removes unwanted installed app(s) and other bugs that may be hindering on your Mac.

Adwcleaner reddit