ADO.NET Provider 220.127.116.11 for Firebird is released with a few bug fixes.
ADO.NET provider 18.104.22.168 for Firebird is available for download with a few fixes .
A few changes are needed to the connection string builder and dll used vs Firebird 2.5
Here is an example on Stack Overflow with FbConnectionStringBuilder:
NHibernate 4.0.1 General Availability is now available for download from Sourceforge and Nuget.
This includes fixes for regressions in NH 4.0.0, and some fixes for mapping-by-code and Firebird issues.
Please see the full release notes for more information: