Examine source code of Fruit Cake

{
  "theme": {
    "images": {
      "theme_frame": "FruitLoaf1.jpg"
    },
    "colors": {
      "frame": "#121111",
      "tab_background_text": "#faf7f7"
    }
  },
  "version": "2.0",
  "name": "Fruit Cake",
  "manifest_version": 2,
  "description": "Fruit loaf with mixed fruit and nut topping on header.  Footer is the cake itself."
}