How to register MIME type for NPAPI plugin in Linux

Hi,

I have written a NPAPI plugin using croos plattform tool(Qt), in
the .res file of my plugin project(on Window OS), I have associated
MIME type with this plugin dll, so that it is getting detected by
firefox, now I wanted to use the same plugin on Linux machine, I have
recompiled the project on Linux machine and getting .so as an output.
But it is not getting detected by firefox , so how do I associate MIME
type with this plugin under Linux env.

or what is equlient of .res file in Linux.??
my dll MIME type is "application/x-shockwave-flash|application/
futuresplash"

Please help

Regards
Ashish