Examine source code of imaffiliated-extension

{
  "manifest_version": 2,
  "background": {
    "scripts": [
      "./serviceworker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.amazon.ca/*",
        "https://*.amazon.com.mx/*",
        "https://*.amazon.com.br/*",
        "https://*.amazon.eg/*",
        "https://*.amazon.cn/*",
        "https://*.amazon.in/*",
        "https://*.amazon.jp/*",
        "https://*.amazon.sg/*",
        "https://*.amazon.ae/*",
        "https://*.amazon.sa/*",
        "https://*.amazon.fr/*",
        "https://*.amazon.de/*",
        "https://*.amazon.it/*",
        "https://*.amazon.nl/*",
        "https://*.amazon.pl/*",
        "https://*.amazon.es/*",
        "https://*.amazon.se/*",
        "https://*.amazon.com.tr/*",
        "https://*.amazon.co.uk/*",
        "https://*.amazon.com.au/*"
      ],
      "js": [
        "js/contentScripts.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icons/16x16.png",
    "48": "icons/48x48.png",
    "128": "icons/128x128.png"
  },
  "content_security_policy": "default-src 'self'; connect-src https://api-imaffiliated.azurewebsites.net/ ;",
  "name": "imaffiliated-extension",
  "version": "1.0.1",
  "description": "Support the people you like for free",
  "author": "Identityex"
}