Examine source code of KoiDark

{
  "theme": {
    "images": {
      "theme_frame": "Koipersona.jpg"
    },
    "colors": {
      "frame": "#e8df64",
      "tab_background_text": "#f7f7f2"
    }
  },
  "version": "2.0",
  "name": "KoiDark",
  "manifest_version": 2,
  "description": "A Koi swims through a dark pond"
}