Examine source code of Extension chachatoy

{
  "manifest_version": 2,
  "name": "Extension chachatoy",
  "description": "Extension chachatoy",
  "version": "2.3",
  "permissions": [
    "notifications",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "index.html"
  },
  "icons": {
    "64": "1.png"
  },
  "background": {
    "scripts": [
      "jquery.js",
      "background.js",
      "soundmanager2.js"
    ]
  }
}