Examine source code of Hutan Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "huti dark",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(39, 39, 39)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(28, 28, 28)",
      "tab_background_text": "rgb(221, 221, 221)",
      "toolbar_field": "rgb(28, 28, 28)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(39, 39, 39)",
      "popup": "rgb(28, 28, 28)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(33, 33, 33)",
      "tab_loading": "rgb(39, 39, 39)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{704f33e6-b890-452e-b7a8-dec0c35e7b39}"
    }
  }
}