Examine source code of Tiger_Green

{
  "theme": {
    "images": {
      "theme_frame": "tiger5.jpg"
    },
    "colors": {
      "frame": "#fcfcfc",
      "tab_background_text": "#00ba3e"
    }
  },
  "version": "2.0",
  "name": "Tiger_Green",
  "manifest_version": 2,
  "description": "One day in the big city"
}