Examine source code of dark Knight

{
  "name": "dark Knight",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "20190912_191603.png"
    },
    "colors": {
      "frame": "rgba(36, 36, 36, 1)",
      "tab_background_text": "rgba(0, 255, 0, 1)",
      "toolbar": "rgba(35, 35, 35, 1)",
      "bookmark_text": "rgba(34, 139, 34, 1)",
      "toolbar_field": "rgba(18, 18, 18, 0.2)",
      "toolbar_field_text": "rgba(200, 200, 200, 1)"
    }
  }
}