Examine source code of Amazon Prime Filter

{
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "*://www.amazon.com/*",
        "*://www.amazon.co.jp/*",
        "*://www.amazon.co.uk/*",
        "*://www.amazon.de/*",
        "*://www.amazon.fr/*",
        "*://www.amazon.it/*",
        "*://www.amazon.ca/*"
      ],
      "run_at": "document_end"
    }
  ],
  "description": "Filter your Amazon searches for Amazon Prime products.",
  "icons": {
    "48": "icon.png",
    "128": "icon.png"
  },
  "manifest_version": 3,
  "name": "Amazon Prime Filter",
  "permissions": [
    "storage"
  ],
  "version": "2.2",
  "browser_specific_settings": {
    "gecko": {
      "id": "{3cba3cbf-6195-4bd5-b7ef-4f9e6664bcdb}"
    }
  }
}