How to view WS/WSS Websocket request content using Firebug or other?

Question

Is there a way to view the Websocket traffic?

Only Websocket headers are visible on the initial handshake.

Everything disappears after the response:

Answer 1

There is WebSocket Monitor - an extension for Firefox developer tools that can be used to monitor WebSocket connections

After the extension is installed, open Firefox Developer Tools and switch to 'Web Sockets' panel. It's displaying WS frame traffic for the current page. There is an extra support for the following protocols:

• Socket IO
• SockJS
• WAMP
• Plain JSON