Examine source code of Instagram PK Viewer

{
  "manifest_version": 3,
  "name": "Instagram PK Viewer",
  "version": "1.0",
  "description": "Shows Instagram PK and profile image",
  "host_permissions": [
    "https://www.instagram.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.instagram.com/*"
      ],
      "js": [
        "inject.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ig-pk-viewer@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}