The FA have confirmed the investigation and the three man independent panel....Danny Murphy, John Aldridge and Luis Suarez.
Can't say fairer than that.
In all seriousness the FA and the Professional Match Officials integrity is massively at stake here if they try and wipe it under the carpet. I expect they'll give Firminio a watered-down charge and 3 match suspension and, to minimise the reaction from Liverpool, they'll give Holgate a three-match ban for the push. For them, that will feel like a justified outcome, whereas if the abuse is proven to be racist it would be a totally unacceptable ill-judged outcome.