Examine source code of His Majesty

{
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  "version": "4.0",
  "theme": {
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      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(32, 45, 59, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(32, 45, 59, 0.06)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{12076195-3801-4115-8a89-6a23e0d46b57}"
    }
  }
}