Examine source code of Tableau Web Extension

{
  "manifest_version": 2,
  "name": "Tableau Web Extension",
  "version": "1.0",
  "description": "A sample Tableau Web Extension to enhance dashboards with custom functionality.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d30fc493-60f9-417a-af7f-bcc4954f1754}"
    }
  }
}