There is now support for the Firebird RDBMS in the most popular ORM for
Perl, DBIx::Class, as of version 0.08121 .

http://search.cpan.org/perldoc?DBIx::Class
http://search.cpan.org/perldoc?DBIx::Class::Storage::DBI::InterBase
http://search.cpan.org/perldoc?DBIx::Class::Storage::DBI::ODBC::Firebird

Using the ODBC driver with DBD::ODBC is recommended.

There is also support for DBIx::Class::Schema::Loader, which is used to
dump schema definitions, as of version 0.06000 .

http://search.cpan.org/perldoc?DBIx::Class::Schema::Loader

This ORM is often used with the Catalyst web framework:

http://www.catalystframework.org/