Examine source code of Amazon Review Sorter

{
  "manifest_version": 3,
  "name": "Amazon Review Sort",
  "version": "1.2.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{89e7d028-b340-4b35-9a0c-1d811ad02885}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.amazon.com/*",
        "*://*.amazon.co.uk/*",
        "*://*.amazon.de/*",
        "*://*.amazon.fr/*",
        "*://*.amazon.it/*",
        "*://*.amazon.es/*",
        "*://*.amazon.ca/*",
        "*://*.amazon.com.mx/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "Icon16.png",
    "32": "Icon32.png",
    "48": "Icon48.png",
    "128": "Icon128.png"
  }
}