Examine source code of Zoe (League of Legends)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Zoe (League of Legends)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(249, 249, 249, 0)",
      "toolbar_text": "rgb(249, 249, 148)",
      "frame": "rgb(117, 56, 151)",
      "tab_background_text": "rgb(201, 160, 236)",
      "toolbar_field": "rgba(225, 197, 248, 0)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(97, 227, 238)",
      "popup": "rgb(244, 195, 169)",
      "popup_text": "rgb(8, 8, 8)",
      "tab_loading": "rgb(97, 227, 238)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{050137ac-321c-4533-9834-d9bec521bb2c}"
    }
  }
}