Examine source code of Always Amazon Smile

{
  "manifest_version": 2,
  "name": "Always Amazon Smile",
  "version": "1.3",
  "description": "Redirect to the smile subdomain of amazon.",
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "smile.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "options.html"
  }
}