Examine source code of Youtube Extra Search

{
  "manifest_version": 3,
  "name": "Extra Search",
  "version": "1.0",
  "description": "Deep grid search for YouTube results.",
  "browser_specific_settings": {
    "gecko": {
      "id": "extra-search-results@yourdomain.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "128": "icon.png"
  },
  "action": {
    "default_icon": "icon.png"
  },
  "permissions": [
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "results.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}