Examine source code of Blue Lightsaber

{
  "theme": {
    "images": {
      "theme_frame": "lightsaber.jpg"
    },
    "colors": {
      "frame": "#47a9e6",
      "tab_background_text": "#403ede"
    }
  },
  "version": "2.0",
  "name": "Blue Lightsaber",
  "manifest_version": 2,
  "description": "a blue lightsaber"
}