Examine source code of Akali (League of Legends)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Akali (League of Legends)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(29, 176, 225, 0.04)",
      "toolbar_text": "rgb(129, 237, 225)",
      "frame": "rgb(59, 35, 12)",
      "tab_background_text": "rgb(214, 192, 39)",
      "toolbar_field": "rgba(233, 182, 155, 0.19)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(30, 123, 173)",
      "popup": "rgb(233, 182, 155)",
      "popup_text": "rgb(8, 8, 8)",
      "tab_loading": "rgb(30, 123, 173)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9d802b51-ed8d-4ca3-af5c-074b36a98193}"
    }
  }
}