haha, make sure you have the latest version of Firefox, then go to one of those links. Scrolling the mouse over the picture will show you what it will look like. From the screen shot above, you see the orange "Wear this persona" button, click that and the persona will save.
Nancy I bet you clicked on it to install and you just needed to restart firefox for the persona to go into effect. So when you shut down and started up today it appeared. Either that or magic elves. :shock: