How to debug web connection in firefox on TCP level?

I have a spooky case - my unlimited stream from server we created (live generated, FLV file with undeclared length) which shall be played via flash player application I created (which is as simple as can be) plays several seconds (mostly one or 2) and stops in firefox. ONLY in firefox for windows. In IE (5-9), any chrom, any safary, firefox under Linux all plays as it should. But on an开发者_运维知识库y FF we tried (2-4) it just somehow kills the stream. I stream to flash player via tcp which emulates http. so for example fiddler 2 does not capture it, wireshark does but it is quite hard to filter only firefox requests.

So I search for some connection monitor inside FF... like a plugin or something more native to ff. Is there something?

You could try logging things from the Firefox end. You can choose to log at the HTTP level or at the socket level, for instance.

You could try using the Apache TCP Monitor. Would allow you to trap only your FF requests easily.