well i answering part of the question to my self.
i found how to configure fd to load the bin/index.html file .
from here :http://www.flashdevelop.org/wikidocs/index.php?title=AS3:Debugging
but it load me the regular flash player i installed in my FF 7.01 version.
how do i change it to use the Debugger flash player ?
searching the forum i solved it with the help of :http://www.flashdevelop.org/community/viewtopic.php?f=13&t=6094