---
title: SFSafariExtensionHandler
framework: safariservices
role: symbol
role_heading: Class
path: safariservices/sfsafariextensionhandler
---

# SFSafariExtensionHandler

A base class that you subclass to handle events in your Safari app extension.

## Declaration

```swift
class SFSafariExtensionHandler
```

## Mentioned in

Adjusting settings for contextual menu items Building a Safari app extension

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSExtensionRequestHandling](foundation/nsextensionrequesthandling.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)
- [SFSafariExtensionHandling](safariservices/sfsafariextensionhandling.md)

## See Also

### Injected style sheets and scripts

- [Using injected style sheets and scripts](safariservices/using-injected-style-sheets-and-scripts.md)
- [Injecting a script into a webpage](safariservices/injecting-a-script-into-a-webpage.md)
- [Injecting CSS style sheets into a webpage](safariservices/injecting-css-style-sheets-into-a-webpage.md)
- [Passing messages between Safari app extensions and injected scripts](safariservices/passing-messages-between-safari-app-extensions-and-injected-scripts.md)
- [SFSafariExtensionManager](safariservices/sfsafariextensionmanager.md)
- [SFSafariExtensionState](safariservices/sfsafariextensionstate.md)
- [SFSafariPageProperties](safariservices/sfsafaripageproperties.md)
- [SFSafariExtensionHandling](safariservices/sfsafariextensionhandling.md)
- [SFExtensionProfileKey](safariservices/sfextensionprofilekey.md)