SouchProd.EntityFrameworkCore.Firebird is an Entity Framework Core provider built on top of the Firebird ADO.NET Data Provider. It enables use the Entity Framework Core 2.0 ORM with Firebird (2.x, 3.0) and Interbase.
CRUD operations are working (insert, update, delete, select), Scaffolding and migrations too (still contain a few bugs, some scenario could lead to an exception). Firebird 3 Identity columns are supported. Firebird 4 Alpha metadata charlength limitation (63 vs 31 before) supported.
Check more here.