Examine source code of фетта → OZON

{
  "manifest_version": 3,
  "name": "фетта → OZON",
  "version": "1.0.3",
  "author": "An1by (https://github.com/an1by)",
  "description": "Добавляет к карточкам товаров на fetta.app ссылку на OZON",
  "icons": {
    "16": "assets/icon-16.png",
    "48": "assets/icon-48.png",
    "64": "assets/icon-64.png",
    "128": "assets/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "fetta-ozon@an1by.github.io",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "host_permissions": [
    "https://fetta.app/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://fetta.app/u/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "inject.js"
      ],
      "matches": [
        "https://fetta.app/*"
      ]
    }
  ]
}