Examine source code of War Devil

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "War Devil",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(48, 50, 50, 0.51)",
      "toolbar_text": "rgb(245, 236, 237)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(246, 240, 242)",
      "toolbar_field": "rgba(140, 151, 162, 0.6)",
      "toolbar_field_text": "rgb(243, 243, 249)",
      "tab_line": "rgb(129, 120, 120)",
      "popup": "rgb(17, 17, 19)",
      "popup_text": "rgb(244, 244, 249)",
      "tab_loading": "rgb(129, 120, 120)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7ffd1664-4c6a-4a76-ae76-ab8706229c18}"
    }
  }
}