Examine source code of jeuxvideo.com

{
  "description": "jeuxvideo.com button",
  "manifest_version": 2,
  "name": "jeuxvideo.com",
  "author": "Fabien Fois",
  "version": "2.1",
  "icons": {
    "64": "icons/64.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/16.png",
      "32": "icons/32.png"
    }
  }
}