Examine source code of Christmas snow fun

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Christmas fun",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg",
        "images/2.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom",
        "center top",
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x",
        "repeat-x",
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgb(225, 234, 239)",
      "toolbar_text": "rgb(248, 112, 140)",
      "frame": "rgb(35, 3, 70)",
      "tab_background_text": "rgb(65, 36, 103)",
      "toolbar_field": "rgba(100, 75, 133, 0.19)",
      "toolbar_field_text": "rgb(11, 1, 40)",
      "tab_line": "rgb(106, 68, 165)",
      "popup": "rgb(13, 1, 32)",
      "popup_text": "rgb(201, 203, 231)",
      "tab_loading": "rgb(106, 68, 165)"
    }
  }
}