Examine source code of ProDark Gnome

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Gnome-Professional-Dark",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(68, 71, 72)",
      "toolbar_text": "rgb(225, 234, 239)",
      "frame": "rgb(94, 94, 94)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(38, 55, 61)",
      "tab_line": "rgb(236, 236, 236)",
      "popup": "rgb(68, 71, 72)",
      "popup_text": "rgb(225, 234, 239)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(236, 236, 236)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{46771ae8-04bd-429d-9bc7-a4e7ff4065b3}"
    }
  }
}