Examine source code of Completely Dark Fox

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "True Dark",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(215, 226, 239)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(10, 10, 10)",
      "popup": "rgb(6, 6, 6)",
      "popup_text": "rgb(215, 226, 239)",
      "icons": "rgb(255, 255, 255)",
      "tab_selected": "rgb(33, 32, 32)",
      "tab_loading": "rgb(10, 10, 10)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{21ba1436-cb83-4a9d-bbb7-748b2eafe03d}"
    }
  }
}