How to view WS/WSS Websocket request content using Firebug or other?
Try Chrome’s developer tools, click ‘Network’ tab use the filters at the bottom to show only WebSocket connections), select the desired websocket connection, note that there are ‘Headers’, ‘Preview’, ‘Response’, etc. sub-tabs to the right, once data starts flowing a ‘WebSocket Frames’ subtab will appear. All data going in either direction is logged. Very informative.