Firebird 2.0.x series discontinued End Of Life
Accordingly to its release lifetime policy, Firebird Project notifies that the Firebird v2.0 series has reached its end of life and thus will not be maintained anymore. The last official release in this series, Firebird 2.0.7, which has been announced this year, will be available from the “discontinued” section of the download area.
The Firebird roadmap is updated , we are waiting for Firebird 3.0.x Alpha 