Firebird and Kmail

Hello! I am using Kmail and MozillaFirebird. Everything ist fine besides the cooperation of these programms. As Firebird is my default browser html-files are to open with it. Also Kmail starts Firebird after clicking a link. But it gives not the link to Firebird but a local path of a copy of that link. This copy is made right after clicking the link and before starting Firebird. What is wrong? Thanks, Johannes