Examine source code of fishy fishy

{
  "theme": {
    "images": {
      "theme_frame": "KoiHeader.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#c3de60"
    }
  },
  "version": "2.0",
  "name": "fishy fishy",
  "manifest_version": 2,
  "description": "Koi fish swimming in pond (black and white cutout)"
}