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# showPreferencesForExtension(withIdentifier:completionHandler:)

Launches Safari and opens the preferences panel for a Safari app extension.

```
class func showPreferencesForExtension(withIdentifier identifier: String, completionHandler: (@Sendable ((any Error)?) -> Void)? = nil)
```

## Parameters

`identifier`

The identifier for a Safari app extension in your app bundle.

`completionHandler`

A completion handler called after the operation completes. The completion handler takes the following parameter:

- error: If an error occurred, this parameter describes the error. If the operation succeeded, this parameter holds `nil`.

## Discussion

> Important:
> You can call this method from synchronous code using a completion handler, as shown on this page, or you can call it as an asynchronous method that has the following declaration:
> 
> ```swift
> class func showPreferencesForExtension(withIdentifier identifier: String) async throws
> ```
> 
> For information about concurrency and asynchronous code in Swift, see <doc://com.apple.documentation/documentation/Swift/calling-objective-c-apis-asynchronously>.

---

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