Examine source code of Ruri-Gokou 2

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#00df00",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Ruri-Gokou 2",
  "manifest_version": 2,
  "description": "Ruri Gokou (Kuroneko)\n\nOre no Imouto ga Konnani Kawaii Wake ga Nai"
}