change the firefox layering

Hi,

I want to remove the full screen mode of firefox.
I don't want to do it programatically.
Is there any way to change this setting in linux.
Using this I have to change the layering of firefox.

how I can achieve this.

thanks

I'm not sure whether I understand you right.

You want to start firefox not in fullscreenmode, but resized? Or prohibit fullscreen-mode?

Manual resizing isn't an option?