Examine source code of Twilight Prom

{
  "name": "Twilight Prom",
  "manifest_version": 2,
  "version": "4.0",
  "theme": {
    "images": {
      "theme_frame": "TwilightProm.jpg"
    },
    "colors": {
      "frame": "rgba(19, 17, 2, 1)",
      "tab_background_text": "rgba(244, 232, 201, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(244, 232, 201, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.24)",
      "toolbar_field_text": "rgba(255, 248, 227, 1)",
      "tab_line": "rgba(255, 241, 173, 0.86)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{66b81485-51d5-4a67-915f-8970e95112f4}"
    }
  }
}