Examine source code of Cosmic Gingkos 3

{
  "theme": {
    "images": {
      "theme_frame": "cosmicgingkos1a-z.jpg"
    },
    "colors": {
      "frame": "#e8b312",
      "tab_background_text": "#f2e311"
    }
  },
  "version": "2.0",
  "name": "Cosmic Gingkos 3",
  "manifest_version": 2
}