Examine source code of assassins_jp

{
  "theme": {
    "images": {
      "theme_frame": "assassin.jpg"
    },
    "colors": {
      "frame": "#616161",
      "tab_background_text": "#a8a8a8"
    }
  },
  "version": "2.0",
  "name": "assassins_jp",
  "manifest_version": 2,
  "description": "シンプルに文字とロゴのみです。\n\n言語：日本語\nlanguage：Japanese"
}