Examine source code of Colourful childhood

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Colourful childhood",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(225, 225, 225, 0.5)",
      "toolbar_text": "rgb(0, 176, 255)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(225, 225, 225)",
      "toolbar_field_text": "rgb(89, 0, 188)",
      "tab_line": "rgb(103, 255, 178)",
      "popup": "rgb(255, 250, 213)",
      "popup_text": "rgb(89, 0, 188)",
      "ntp_background": "rgb(188, 234, 255)",
      "ntp_text": "rgb(217, 0, 74)",
      "popup_border": "rgb(255, 225, 0)",
      "tab_text": "rgb(0, 122, 60)",
      "toolbar_field_border": "rgb(255, 117, 164)",
      "tab_loading": "rgb(103, 255, 178)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f45e9012-c721-4c70-aed0-a0bf73ef8fdf}"
    }
  }
}