I’m guessing it’s a script buried in an ad. The dummy.com site looks like the kind of placeholder site that appears by default when a domain name expires. Because it’s an ad, the scipt is tripped because it thinks you’re trying to access a site with an expired domain.
But I’m just guessing. I’m no expert. I have, however, found that you can avoid it by stopping the site from loading before it is fully loaded – when the progress bar is at about 90% complete. When the page loads, it appears as a blank page. F1 Fanatic logo loads first, and then the remainder of the page content. Stop the browser once the content has appeared, but before the progress bar is complete, and you will not get redirected.