Examine source code of Dragon in Black

{
  "theme": {
    "images": {
      "theme_frame": "DragoninBlackH.jpg"
    },
    "colors": {
      "frame": "#187cba",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Dragon in Black",
  "manifest_version": 2,
  "description": "simple with blue background"
}