Examine source code of Table Dent

{
  "name": "Table Dent",
  "description": "Don't have enough ads interrupting your sight on the web? Just double them by clicking the icon!",
  "version": "1.1.6",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "adDoubler.js"
    ]
  },
  "permissions": [
    "activeTab"
  ],
  "action": {},
  "icons": {
    "16": "/images/ad_doubler16.png",
    "32": "/images/ad_doubler32.png",
    "48": "/images/ad_doubler48.png",
    "128": "/images/ad_doubler128.png"
  }
}