I created a desktop shortcut that opens Firefox to a particular URL following these instructions. In the instructions they show you how to customize it with a particular image. I was able to do this, but when I drag the shortcut from the desktop to the launcher bar it shows up as a springboard instead of my image. How can I change the image for the icon in the laucher bar? When I right click on the laucher icon the only options are to open it or to remove it from the launcher bar.