Thank you! This works great adding ' && "ontouchend" in document'

Thanks Quinn, that's what I feared. Are there any best-practices, or additional hints, to improve compatibility? There must be some built-in functionality to allow multiple observers, because it's impossible to see who the other observers are. You can "guess", when directories have a specific name. But if another extension is watching Documents or Downloads, for example, and my extensions also wants to watch that same common directory, I'd potentially have no idea.