There is now support for the Firebird RDBMS in the most popular ORM for Perl

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/