Examine source code of Green Green Grass

{
  "theme": {
    "images": {
      "theme_frame": "green-grass-header.jpg"
    },
    "colors": {
      "frame": "#dbdbdb",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Green Green Grass",
  "manifest_version": 2,
  "description": "On a sunny afternoon, what is better than sitting on a nice patch of green grass?"
}