Test on an Existing Browser

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If you need to control a browser that's already open — with specific tabs, complex state, or extensions you've configured manually — you can attach to it instead of launching a new one.

Simpler alternative

For most cases, a persistent Chrome profile is simpler and doesn't require any setup. Use the relay approach below only when you need to interact with a browser that's already running.

This uses the Shiplight Chrome Extension as a relay between your agent and your browser. See Attach to Existing Browser for setup — you'll need to install the extension and enable the relay server. A direct CDP connection (no extension) is also supported.

Attach to my browser and check if the payment form
on the current page has any console errors.

Your agent auto-discovers tabs via the extension relay — no URL or configuration needed.