Examine source code of cdiscount.com

{
  "description": "cdiscount.com button",
  "manifest_version": 2,
  "name": "cdiscount.com",
  "author": "Fabien Fois",
  "version": "3.0",
  "icons": {
    "64": "icons/cdiscount-64.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/cdiscount-16.png",
      "32": "icons/cdiscount-32.png"
    }
  }
}