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

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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Contributors to this page: irenesmith, MNizam0802, Sheppy, wbamberg, mfluehr
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