I just got a site redirect to this (copied from my browser history, as I closed the tab already)
(Putting it in the hide tag because the URL appears to have my IP address and some other info embedded into it.)
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It basically made two of those loud motherboard-sounding beeps and then had a popup like, "You have a virus! Click here to make it go away!"
It's not the first time it's happened. I see others talking about a "winning stuff" version, but for me it's always the "click here to make the virus go away" one.
OS: Windows 10
Browser: Firefox (but I've seen it in Edge, too.)