Examine source code of Double Phantasy

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    "properties": {},
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      "tab_background_text": "rgb(241, 238, 236)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(63, 25, 5)",
      "tab_line": "rgb(10, 5, 1)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(23, 23, 22)",
      "button_background_active": "rgb(209, 101, 80)",
      "icons_attention": "rgb(133, 25, 5)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(67, 42, 22)",
      "ntp_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(10, 5, 1)"
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  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ee0192bb-6f1e-45df-bf6f-991b113b029d}"
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