Examine source code of Colourful Circles Pattern

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Colourful Circles Pattern",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg",
        "images/2.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top",
        "right top",
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat",
        "repeat",
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(11, 161, 178, 0.6)",
      "toolbar_text": "rgb(255, 190, 0)",
      "frame": "rgb(0, 96, 185)",
      "tab_background_text": "rgb(11, 11, 110)",
      "toolbar_field": "rgba(116, 189, 32, 0.65)",
      "toolbar_field_text": "rgb(255, 52, 0)",
      "tab_line": "rgb(45, 45, 255)",
      "popup": "rgb(16, 132, 109)",
      "popup_text": "rgb(0, 174, 255)",
      "button_background_active": "rgb(117, 218, 15)",
      "tab_loading": "rgb(45, 45, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bd54f633-604c-4267-bcd4-2360efe2d421}"
    }
  }
}