> I am interesting to use Firebird in a project Java-JSP.
> How can I use it?

You have two options: use InterClient JDBC driver or use JCA-JDBC
driver. Former is easier to use, latter is supported :)

So, if you know how to use JDBC in JSPs, you should not have too much
problems there. If not, you need to find good resource on this topic.

Best regards,
Roman Rokytskyy