Subject pretty much says it all, any wallpaper, scan, or doujin over 500k in size, when you download it in firefox 1.0.7 the images do not get placed in the browser cache, meaning if you right click --> save image as, the image gets downloaded again rather then just copied out of the browser cache, or if you drag the image out of the browser and drop it in a folder, the image is created as a zero byte file.

they should now =)