I do shut my computer down regularly; I just can't do right now as I have files converting.
This pop up thing is definitely linked to MB. It's not coming up on any other sites and I even checked on Edge, to see, and as soon as I logged onto MB up it came. Changed to another website, no sign of it. Which is why I assumed it was something instigated by the owners, but if not, then why do you think it is only coming up on MB?
I've run a scan with MS and no threats found. I can do Malwarebytes but it warns it may reboot my PC, which at the moment I can't afford to let happen. The "privacy notice" is completely generic, mentions no site, program, software provider or anything, and doesn't seem to be doing anything, but lurking there in the corner, what mischief might it be up to?
Here are screenshots. The first is on Edge, the second here as I write this, on Opera.
