I was wondering if there was an addon or a way of adding to the 'right-click' menu that when you right-click on a picture, I could have the option to 'search by image' on Google. There is already an option to search for text on Google and obviously, Firefox knows when I'm clicking a picture because the options are different. Would it be easy enough (or is there something already out there that I haven't found) to add a 'Google search by image' into the menu?