Examine source code of IframeSandboxInspector

{
  "manifest_version": 3,
  "name": "IframeSandboxInspector",
  "version": "1.0.0",
  "description": "Audit iframe sandbox, allow, loading, and credential policy attributes.",
  "icons": {
    "48": "frame/icon-48.png",
    "96": "frame/icon-96.png",
    "128": "frame/icon-128.png"
  },
  "action": {
    "default_title": "IframeSandboxInspector",
    "default_popup": "inspect/view.html",
    "default_icon": {
      "48": "frame/icon-48.png"
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "clipboardWrite"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{10f990c0-22c7-48c3-a627-f99c3711b7ed}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}