Examine source code of Wizz-reloaded

{
  "manifest_version": 2,
  "name": "Wizz-reloaded",
  "version": "1.3",
  "description": "Ping everyone !",
  "icons": {
    "48": "icons/ping.png"
  },
  "browser_action": {
    "default_icon": "icons/ping.png",
    "default_title": "Wizzzzz",
    "default_popup": "popup/ping.html"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "background.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "assets/cage/1.jpg",
    "assets/cage/2.jpg",
    "assets/cage/3.jpg",
    "assets/cage/4.jpg",
    "assets/cage/5.jpg",
    "assets/cage/6.jpg",
    "assets/cage/7.jpg",
    "assets/gandalf/gandalf.gif",
    "assets/pngwheel.png",
    "assets/combocom.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4b69bb66-5891-4c58-900a-027309716740}"
    }
  }
}