I have an idea for those of you who call these Tech Support Popup numbers, ask the scammer:
"What part of Windows/MacOS has the ability to detect and send an Alert/Warning message to a 3rd party Web Browser, with your number?" -----------
It might be a good way to waste some time and get a kick out of any explanation they come up with.
I'm curious as to how they would explain their number getting included in the alert message.