The Debian project presents its new stable version 8 (code name “Jessie”), which will be supported for the next 5 years

After almost 24 months of constant development the Debian project presented its new stable version 8 (code name “Jessie”), which will be supported for the next 5 years

Firebird version in Jessie is 2.5.3 with updates
https://packages.debian.org/source/jessie/firebird2.5