Examine source code of SmartManifyer

{
  "manifest_version": 3,
  "name": "SmartManifyer",
  "version": "1.0",
  "description": "Заменяет все миниатюры видео на YouTube Smart Man with Glasses.",
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "image.jpg"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "funnyid@fake.email"
    }
  }
}