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when i use "--gdk-debug" option with firefox command on RHEL then it opens firefox window simply then what is the reason of it,should there be any change through this option in firefox?
when i use "--gtk-module" option with firefox command without argument then the error is shown to give some argument then what type of argument is needed and why?

You have asked some related questions---most of which appear to be homework.

Please tell us the context of all of this---i.e. what overall problem are you trying to solve?

If it is homework, then you need to tell us what course materials you use and what other sources of info you have tried.