Reported *.firebaseio.com Domain Blocking

[Michael Gorham]

We have several clients reporting ERR_CONNECTION_RESET when loading our page with a firebase include in it.  See first attached screenshot.

Seems like the domain is being blocked by either browser (ad blocker), device (windows firewall), or network (Cisco Talos).

It's plausible that even the *.firebaseio.com domain is being blocked.  See second attached screenshot.

Is there a way to CNAME alias [our_database_subdomain_name].firebaseio.com to firebase.[our_domain_name].com to bypass *.firebaseio.com blocking?