I'm a long time FlameRobin user and Firebird lover.  After a server upgrade, I found that FlameRobin doesn't run on Windows Server 2016.  

Here's the cure:

New Firebird admin tool called FireBolt.  Replaces FlameRobin.

Get your copy here: https://www.jetlyt.ca/

Learn more here:  https://www.amazon.ca/dp/B07D42WGH9.