Examine source code of Amazon Coupon Sorter

{
  "manifest_version": 2,
  "name": "Amazon Coupon Sorter",
  "version": "1.0",
  "description": "Sort Amazon search results to show listings with clippable coupons first.",
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.amazon.ae/*",
        "https://www.amazon.ca/*",
        "https://www.amazon.cn/*",
        "https://www.amazon.co.jp/*",
        "https://www.amazon.co.uk/*",
        "https://www.amazon.co.za/*",
        "https://www.amazon.com/*",
        "https://www.amazon.com.au/*",
        "https://www.amazon.com.br/*",
        "https://www.amazon.com.sg/*",
        "https://www.amazon.com.tr/*",
        "https://www.amazon.de/*",
        "https://www.amazon.eg/*",
        "https://www.amazon.es/*",
        "https://www.amazon.fr/*",
        "https://www.amazon.in/*",
        "https://www.amazon.it/*",
        "https://www.amazon.mx/*",
        "https://www.amazon.nl/*",
        "https://www.amazon.pl/*",
        "https://www.amazon.se/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "amazon-coupon-sorter@example.com"
    }
  }
}