Not being a dick with this reply, but it's gonna depend how you read it.... I would say because nothing's perfect, your question would be better suited to the developers of the programs you ran. It sounds like you did the right thing though, testing Chrome to check it and removing the extension manually. I've had to do this myself on a few occasions, than all of a sudden I notice one of the programmes does start to delete it. So I'd have to assume the Ad generator is just a new one not picked up yet. These plug-ins and extensions seem to come out every other day!? If you don't already, Ccleaner tools section lists all of the add-ons for the most popular browser's as well as startup items, etc.
Hope that helps.
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