Possibly could be my Ad-block extension. At any rate, it is no longer happening on my end, and my virus scan turns up nothing, so it was probably my browser itself. As Xiahou said, it was possibly a Google Chrome issue to begin with, and the main site I was visiting was the Org, so that looks like just probability, kicking in at the same time I was on the Org, but purely coincidental. It kicked in later while I was on a different website as well.