Examine source code of Amazon Smile Redirect

{
  "name": "Amazon Smile Redirect",
  "version": "0.1.1",
  "description": "Automatically redirect to Amazon Smile",
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "https://www.amazon.ca/*",
        "https://www.amazon.co.jp/*",
        "https://www.amazon.co.uk/*",
        "https://www.amazon.com/*",
        "https://www.amazon.de/*",
        "https://www.amazon.es/*",
        "https://www.amazon.fr/*",
        "https://www.amazon.it/*",
        "https://smile.amazon.ca/*",
        "https://smile.amazon.co.jp/*",
        "https://smile.amazon.co.uk/*",
        "https://smile.amazon.com/*",
        "https://smile.amazon.de/*",
        "https://smile.amazon.es/*",
        "https://smile.amazon.fr/*",
        "https://smile.amazon.it/*"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/logo16.png",
    "48": "icons/logo48.png",
    "128": "icons/logo128.png"
  },
  "manifest_version": 2
}