Examine source code of Amazon Vine Ultraviner

{
  "name": "Amazon Vine Ultraviner",
  "description": "Optimize ordering and reviewing experience for Amazon Vine Users.",
  "version": "1.0.11",
  "manifest_version": 3,
  "permissions": [
    "storage"
  ],
  "content_security_policy": {
    "extension_pages": "default-src 'self'; script-src 'self';  style-src 'self' 'unsafe-inline'; connect-src 'self' https://api.ultraviner.com wss://api.ultraviner.com https://*.media-amazon.com https://api.llamastories.com; img-src 'self' https://*.media-amazon.com;"
  },
  "icons": {
    "48": "ultraviner-icon.png"
  },
  "action": {},
  "background": {
    "scripts": [
      "service_worker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.amazon.com/vine/*",
        "*://*.amazon.co.uk/vine/*",
        "*://*.amazon.ca/vine/*",
        "*://*.amazon.fr/vine/*",
        "*://*.amazon.it/vine/*",
        "*://*.amazon.de/vine/*",
        "*://*.amazon.es/vine/*",
        "*://*.amazon.co.jp/vine/*",
        "*://*.amazon.com.au/vine/*",
        "*://*.amazon.sg/vine/*"
      ],
      "js": [
        "react.production.min.js",
        "react-dom.production.min.js",
        "launcher.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "matches": [
        "*://*.amazon.com/vine/*",
        "*://*.amazon.co.uk/vine/*",
        "*://*.amazon.ca/vine/*",
        "*://*.amazon.fr/vine/*",
        "*://*.amazon.it/vine/*",
        "*://*.amazon.de/vine/*",
        "*://*.amazon.es/vine/*",
        "*://*.amazon.co.jp/vine/*",
        "*://*.amazon.com.au/vine/*",
        "*://*.amazon.sg/vine/*"
      ],
      "js": [
        "country.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e16f5ee-e63f-4a16-9b73-f91d1cf75734}"
    },
    "gecko_android": {
      "id": "{7e16f5ee-e63f-4a16-9b73-f91d1cf75734}"
    }
  }
}