This has been happening for a few days now, and I can't find the source. I'll be on one of my site pages, then I'm suddenly redirected to a page that's spoofing my internet provider and claiming that I've won some nonsense.

So far the destination URLs have been fortunateperson.space and snowwhite.space. And so far, it's only happened while I'm using Firefox.

I have both domains blocked in Adsense, but I'm still getting redirected. And since it happens sporadically and quickly, I have no idea what ad is causing it.

Any suggestions on what to block to stop it?