The screen is 17cm deep. The header task bar is 4 cm deep and the bottom bar is 2 cm deep. This leaves me 11 cm of screen space, sometimes less if the message I am reading has large headers and footers. This has happened since changes were made to Firefox Mozilla. The icons and text are already a small size, there is just too much space around them. I am not tech minded so is there an easy way to deal with this. I hope so because I want to stay with Firefox.