Examine source code of Snow joy

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Snow joy",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(231, 196, 188, 0.5)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(149, 28, 12)",
      "tab_line": "rgb(255, 22, 0)",
      "popup": "rgb(231, 246, 244)",
      "popup_text": "rgb(104, 19, 8)",
      "tab_loading": "rgb(255, 22, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6cee0ec8-8239-46e2-9a0e-0a38e052f274}"
    }
  }
}