Surely to right click it must have a context menu entry were you scan scan as I don't think that they yet have a mind reading function to know what you want to do, save file, open in new tab, etc.
I just can't see how they can do that without having some sort of selection, e.g. menu (a right click menu). Obviously I'm not speaking from personal experience (just logic) as I don't use Chrome, I have tried it a few times and it has never survived very long before being uninstalled; I just like my add-ons and configurability of firefox...