Examine source code of Yellow Box

{
  "theme": {
    "images": {
      "theme_frame": "head.jpg"
    },
    "colors": {
      "frame": "#cccc35",
      "tab_background_text": "#787312"
    }
  },
  "version": "2.0",
  "name": "Yellow Box",
  "manifest_version": 2,
  "description": "yellow box net cafe"
}