<!--
{
  "availability" : [
    "iOS: 17.4.0 -",
    "iPadOS: 17.4.0 -",
    "macOS: 14.3.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "BrowserEngineKit",
  "identifier" : "/documentation/BrowserEngineKit/RestrictedSandboxAppliable",
  "metadataVersion" : "0.1.0",
  "role" : "Protocol",
  "symbol" : {
    "kind" : "Protocol",
    "modules" : [
      "BrowserEngineKit"
    ],
    "preciseIdentifier" : "s:16BrowserEngineKit26RestrictedSandboxAppliableP"
  },
  "title" : "RestrictedSandboxAppliable"
}
-->

# RestrictedSandboxAppliable

A protocol that browser extensions implement to opt into a more restricted sandbox.

```
protocol RestrictedSandboxAppliable
```

## Overview

Call [`applyRestrictedSandbox(revision:)`](/documentation/BrowserEngineKit/RestrictedSandboxAppliable/applyRestrictedSandbox(revision:)) to enter the restricted sandbox, indicating which revision of the sandbox restrictions to apply.

In the first revision ([`RestrictedSandboxRevision.revision1`](/documentation/BrowserEngineKit/RestrictedSandboxRevision/revision1)), additional restrictions affect the web content extension only.

For more information, see [Limiting resource access in web content extensions](/documentation/BrowserEngineKit/limiting-resource-access-in-content-extensions).

## Topics

### Applying sandbox restrictions

[`func applyRestrictedSandbox(revision: RestrictedSandboxRevision)`](/documentation/BrowserEngineKit/RestrictedSandboxAppliable/applyRestrictedSandbox(revision:))

Puts a browser extension into a more restricted sandbox.

[`enum RestrictedSandboxRevision`](/documentation/BrowserEngineKit/RestrictedSandboxRevision)

Revisions to the restricted sandbox rules.

## Relationships

### Inherited By

[`WebContentExtension`](/documentation/BrowserEngineKit/WebContentExtension)

[`NetworkingExtension`](/documentation/BrowserEngineKit/NetworkingExtension)

[`RenderingExtension`](/documentation/BrowserEngineKit/RenderingExtension)

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)