Yep - it can certainly happen in that fashion if the ad vendor isn't vetting the submissions. Google has historically been pretty clean on this though. From the facebook discussion, it is interesting that incognito mode caused it not to happen, but running outside of incognito mode allowed it to happen. Unless it's a coincidence, that still points to a local extension doing something quirky. While viglink uses a javascript script on the page, I think that is still running in incognito (need to confirm), so that behavior doesn't quite track with what people are apparently seeing.
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