Examine source code of Pixel-style city

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Pixel-style city",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(56, 16, 33, 0.24)",
      "toolbar_text": "rgb(255, 217, 224)",
      "frame": "rgb(253, 253, 253)",
      "tab_background_text": "rgb(141, 38, 62)",
      "toolbar_field": "rgba(236, 191, 206, 0.52)",
      "toolbar_field_text": "rgb(86, 86, 211)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgba(228, 196, 203, 0.71)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{02e7c323-8734-4c0a-928b-4ad8cfcd706c}"
    }
  }
}