Examine source code of CMG Hacks

{
  "manifest_version": 2,
  "name": "CMG Hacks",
  "description": "Adds things to cool math games to make it better! Click the icon to learn more!",
  "version": "3.1",
  "permissions": [
    "cookies",
    "http://www.coolmathgames.com/"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.coolmathgames.com/0-*",
        "*://coolmathgames.com/0-*"
      ],
      "js": [
        "jquery.js",
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon_16x16.png",
    "32": "icons/icon_32x32.png",
    "128": "icons/icon_128x128.png"
  },
  "browser_action": {
    "default_icon": "icons/icon_16x16.png",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "asfvsdtfz@sdfhaetgaergfaergset.aergssdfwE"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  }
}