Examine source code of Snowy forest

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Snowy forest",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(9, 53, 75, 0.53)",
      "toolbar_text": "rgb(0, 30, 77)",
      "frame": "rgb(29, 96, 113)",
      "tab_background_text": "rgb(45, 73, 144)",
      "toolbar_field": "rgba(9, 48, 84, 0.62)",
      "toolbar_field_text": "rgb(84, 187, 208)",
      "tab_line": "rgb(15, 167, 235)",
      "popup": "rgba(7, 39, 65, 0.76)",
      "popup_text": "rgb(13, 145, 204)",
      "tab_loading": "rgb(15, 167, 235)"
    }
  }
}