DbFace use PHP interbase driver to connect FireBird/Interbase database. You need to enable php-interbase extension. Open php.ini, and find

extension=php_interbase.dll

Click the Settings -> Connections and go to "Connections" section, click "Add New Connection" button, enter your firebird database information:

Connect to firebird in DbFace

Your firebird database are powered by DbFace now.

Build reports and dashboards for Firebird in DbFace