How do I stop Facebook messenger pop-ups on Safari?
I'm not a Facebook user, and have no Facebook account.
When browsing certain websites on Safari I get an annoying pop-up in the bottom left of the screen inviting me to chat with the website owner on "messenger".
I click the cross in the top right of the window, and the pop-up disappears, only to re-appear again immediately.
How do I permanently get rid of these pop-ups, ideally on all websites I visit. I have no desire to"log on to Facebook Messenger" as they suggest.
MacBook Pro 13", macOS 10.14