Examine source code of Fallen Dragon's Lair v2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Fallen Dragon's Lair v2",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(54, 54, 54)",
      "toolbar_text": "rgb(224, 224, 224)",
      "frame": "rgb(12, 12, 12)",
      "tab_background_text": "rgb(202, 202, 202)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(202, 202, 202)",
      "tab_line": "rgb(255, 0, 0)",
      "popup": "rgba(36, 36, 36, 0.83)",
      "popup_text": "rgb(224, 224, 224)",
      "button_background_active": "rgba(255, 0, 0, 0.19)",
      "button_background_hover": "rgba(224, 224, 224, 0.19)",
      "frame_inactive": "rgb(0, 0, 0)",
      "icons_attention": "rgb(255, 0, 0)",
      "ntp_background": "rgb(54, 54, 54)",
      "ntp_text": "rgb(202, 202, 202)",
      "popup_border": "rgb(12, 12, 12)",
      "popup_highlight_text": "rgb(255, 0, 0)",
      "popup_highlight": "rgba(52, 0, 0, 0.34)",
      "sidebar_border": "rgb(0, 0, 0)",
      "sidebar_highlight_text": "rgb(0, 0, 0)",
      "sidebar_highlight": "rgb(255, 0, 0)",
      "sidebar_text": "rgb(202, 202, 202)",
      "sidebar": "rgb(12, 12, 12)",
      "tab_background_separator": "rgb(0, 0, 0)",
      "tab_loading": "rgb(255, 0, 0)",
      "tab_selected": "rgb(33, 0, 0)",
      "tab_text": "rgb(255, 0, 0)",
      "toolbar_bottom_separator": "rgb(12, 12, 12)",
      "toolbar_field_border_focus": "rgba(255, 0, 0, 0.19)",
      "toolbar_field_focus": "rgba(24, 24, 24, 0.93)",
      "toolbar_field_highlight_text": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgb(255, 0, 0)",
      "toolbar_field_text_focus": "rgb(210, 210, 210)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0d2bedce-b919-4e43-97ad-18d560781c16}"
    }
  }
}