I like the idea, but I think the description is really vague right now. "Translate words on a picture" could mean anything from running unreliable OCR on an image, passing the result through the translator and then putting it on a simple popup, up to something more sophisticated like Project Naptha's translation feature. Tentative kudos because I think it'd be amazing if Mozilla ever managed to get the more important stuff out of the way (like adding more highly used languages to translate) and then proceeded to tackle ideas like this one.