In Firefox, beside that, you can press Ctrl + I, open the "Media" tab, and pick any of the graphics that were already downloaded to display the page. Then you can save the picture(s) you're interested in. I suppose the source of it is the local cache.
Does not work in this particular case, of course, because the whole image is not yet in the cache.
Does not work in this particular case, of course, because the whole image is not yet in the cache.