Well, once you learn the backwards behavior of the buttons, nothing will get sent to mozilla (click "download" and not "save"). I thought it would be cool to save the entire page, even the parts that aren't in view (difficult with operating-system screenshot tools). (I couldn't figure out how to make this work.) And yes, you can right-click on the screenshot button and remove it from the toolbar (I don't think this would disable the entire feature, maybe there's a keyboard shortcut to activate it as well).