Examine source code of Apple Hello Green

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Apple Hello Green",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(41, 63, 69, 0.8)",
      "toolbar_text": "rgb(27, 170, 177)",
      "frame": "rgb(14, 50, 50)",
      "tab_background_text": "rgb(148, 157, 173)",
      "toolbar_field": "rgba(0, 0, 0, 0.2)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(28, 171, 176)",
      "popup": "rgb(22, 54, 75)",
      "popup_text": "rgb(251, 131, 165)",
      "tab_loading": "rgb(28, 171, 176)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9b0a5863-fc04-4f1a-be30-f128f3f89504}"
    }
  }
}