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# registerCustomURLScheme(_:)

Registers a custom URL scheme that can be used in match patterns.

```
class func registerCustomURLScheme(_ urlScheme: String)
```

## Parameters

`urlScheme`

The custom URL scheme to register.

## Discussion

This method should be used to register any custom URL schemes used by the app for the extension base URLs, other than `webkit-extension`, or if extensions should have access to other supported URL schemes when using `<all_urls>`.

---

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