Steele's "firewall" text sent on March 18, 2017. Comey was still head of the FBI until May 9, 2017.
I should've realized that sooner.
Perhaps the meaning of "firewall" was the obvious conclusion which would be COMEY/STRZOK/PAGE since it's already proven they obstructed justice in the Hillary investigation and participated in fabricating evidence in the plot to frame Donald Trump.
I think the firewalls in question are probably made of silver and lead.
Have heard that Page might be singing. Even so, if Sessions, Wray, et al., refuse to do their jobs and prosecute the traitors, we’re screwed.