> Now, I checked the code and noticed a  getTransientForHint being used to
> check for this. Is there a way to add the above to it?

Did you have success? I'm having the same problem... each time firefox
spawn a window it appears in a fixed workspace (which is not always
the same that I'm using it), also most of them are dialogs, but they
tend to tile themselvs which is umconfortable.