Examine source code of sleeping at last

{
  "theme": {
    "images": {
      "theme_frame": "board_ful3lsize.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#f7f2f2"
    }
  },
  "version": "2.0",
  "name": "sleeping at last",
  "manifest_version": 2,
  "description": "music,sleeping at last,sweet!"
}