Reply/Forward bar at the botom of each email

The Reply/Forward bar at the bottom of each email is something I would like to remove from my laptop screen. It consumes over 20% of my screen area. As I have vision issues, this is a waste of viewable space that would be better used showing the contents of each email. Overall, Firefox displays too many fixed items like toolbars, etc. that reduce the usable working area meaning that I scroll (both side-to-side and up-to-down) so much to see the full contents of an email that I sometimes lose the context. Is there a setting that will remove this bar & others from my screen? I know the menu selections for these functions and definitely do NOT need a full-size bar that I never use and wastes scarce screen space. Thanks Tom Friedrich