Examine source code of Xp Longhorn

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Xp Longhorn",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(92, 191, 255)",
      "toolbar_text": "rgb(156, 186, 233)",
      "frame": "rgb(35, 137, 64)",
      "tab_background_text": "rgb(41, 53, 113)",
      "toolbar_field": "rgb(83, 210, 119)",
      "toolbar_field_text": "rgb(44, 47, 215)",
      "tab_line": "rgb(40, 75, 50)",
      "popup": "rgb(8, 79, 28)",
      "popup_text": "rgb(0, 91, 190)",
      "tab_loading": "rgb(40, 75, 50)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4f2cab61-d23d-4c92-b100-533b1ba25030}"
    }
  }
}