Developer tools that are not built into Firefox, but ship as separate add-ons.

Add-ons as a rule necessitate that you give your consent before they're introduced on your PC. In any case, some may be introduced without your insight. This can happen if the add-on was part of another program that you installed. 

WebSocket Monitor
Examine the data exchanged in a WebSocket connection. This add-on is no longer available, as it requires older versions of Firefox. You might give WebSocket Sniffer a try. It's not as detailed but may help.

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