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@dcc
Does arecord produce audible results for you? If so, it should also work in FF with apulse.
The only thing that comes to mind, there are model-specific fixed for snd-hda-audio.
This HP laptop, I'm typing this on, is pretty well supported it even has a LED to indicate whether mic is muted or not, but I have to pass "model=hp-led" to snd-hda-intel for it to work, maybe you need something like that too.