Examine source code of black puzzle

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "black puzzle",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(240, 55, 12, 0)",
      "toolbar_text": "rgb(72, 235, 11)",
      "frame": "rgb(248, 59, 23)",
      "tab_background_text": "rgb(17, 11, 236)",
      "toolbar_field": "rgba(42, 28, 210, 0.39)",
      "toolbar_field_text": "rgb(255, 0, 0)",
      "tab_line": "rgb(255, 0, 0)",
      "popup": "rgb(12, 11, 11)",
      "popup_text": "rgb(255, 0, 0)",
      "tab_loading": "rgb(255, 0, 0)"
    }
  }
}