FbDbMon
Small web-based application for monitoring Firebird database
FbDbMon (Firebird database monitor) is a small utility for monitoring Firebird server state. It should help you with tweaking database for best performance. It can tell you configuration of firebird server itself and database. It displays all current connections and running transactions. It will calculate cache hit ratio for them.
It can also log transactions running on database and help you with performance optimizing of you applications.