Examine source code of Happy baloons

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Happy baloons",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(223, 242, 255, 0.5)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(100, 177, 220)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(203, 255, 234, 0.5)",
      "toolbar_field_text": "rgb(55, 0, 132)",
      "tab_line": "rgb(255, 74, 215)",
      "popup": "rgb(180, 218, 239)",
      "popup_text": "rgb(0, 53, 132)",
      "ntp_background": "rgb(180, 218, 239)",
      "ntp_text": "rgb(184, 76, 0)",
      "tab_selected": "rgba(226, 226, 226, 0.5)",
      "toolbar_field_focus": "rgb(220, 255, 242)",
      "toolbar_field_text_focus": "rgb(161, 0, 52)",
      "tab_loading": "rgb(255, 74, 215)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{90962811-be08-4b10-96e4-dfa0ae3ba5a6}"
    }
  }
}