Examine source code of Double Mushrooms 2

{
  "theme": {
    "images": {
      "theme_frame": "dmush1.jpg"
    },
    "colors": {
      "frame": "#12fa53",
      "tab_background_text": "#f7ec11"
    }
  },
  "version": "2.0",
  "name": "Double Mushrooms 2",
  "manifest_version": 2,
  "description": "Mushrooms my kid found in our brook, different angle."
}