Examine source code of Trees and snowy winter

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Trees and snow",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(238, 243, 243, 0.57)",
      "toolbar_text": "rgb(7, 0, 11)",
      "frame": "rgb(156, 140, 166)",
      "tab_background_text": "rgb(251, 251, 251)",
      "toolbar_field": "rgba(255, 255, 255, 0)",
      "toolbar_field_text": "rgb(13, 1, 15)",
      "tab_line": "rgb(0, 5, 0)",
      "popup": "rgb(244, 240, 247)",
      "popup_text": "rgb(10, 0, 12)",
      "tab_loading": "rgb(0, 5, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e7e9bb4e-5034-41c1-a611-2d0d16f583e0}"
    }
  }
}