Then, use the allowlist to allow access to a limited list of URLs.
For syntax and examples, see.
What is Profile Visitors for Facebook? But Facebook not confirms who they are.
Unfortunately, almost all these are apps are just spam and the results of who visited my Facebook profile are simply bogus.
Sometimes, the blocklist and allowlist does not work as expected.
If you do not need that functionality, you can right-click the icon and select to hide it from the context menu.