puppeteer/docs/api/puppeteer.extensiontransport.md

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---
sidebar_label: ExtensionTransport
---
# ExtensionTransport class
Experimental ExtensionTransport allows establishing a connection via chrome.debugger API if Puppeteer runs in an extension. Since Chrome DevTools Protocol is restricted for extensions, the transport implements missing commands and events.
#### Signature:
```typescript
export declare class ExtensionTransport implements ConnectionTransport
```
**Implements:** [ConnectionTransport](./puppeteer.connectiontransport.md)
## Remarks
The constructor for this class is marked as internal. Third-party code should not call the constructor directly or create subclasses that extend the `ExtensionTransport` class.
## Properties
<table><thead><tr><th>
Property
</th><th>
Modifiers
</th><th>
Type
</th><th>
Description
</th></tr></thead>
<tbody><tr><td>
<span id="onclose">onclose</span>
</td><td>
`optional`
</td><td>
() =&gt; void
</td><td>
</td></tr>
<tr><td>
<span id="onmessage">onmessage</span>
</td><td>
`optional`
</td><td>
(message: string) =&gt; void
</td><td>
</td></tr>
</tbody></table>
## Methods
<table><thead><tr><th>
Method
</th><th>
Modifiers
</th><th>
Description
</th></tr></thead>
<tbody><tr><td>
<span id="close">[close()](./puppeteer.extensiontransport.close.md)</span>
</td><td>
</td><td>
</td></tr>
<tr><td>
<span id="connecttab">[connectTab(tabId)](./puppeteer.extensiontransport.connecttab.md)</span>
</td><td>
`static`
</td><td>
</td></tr>
<tr><td>
<span id="send">[send(message)](./puppeteer.extensiontransport.send.md)</span>
</td><td>
</td><td>
</td></tr>
</tbody></table>