This is a great resource: https://wiki.archlinux.org/index.php/GNOME

See: https://wiki.archlinux.org/index.php/GNOME#Reduce_title_bar_...

But the tweak tool lets you change the font size which was enough for me. I also installed htitle to firefox to hide the title bar when full screen.

Thank you! I will give it a go.

Keep in mind a few of the commands only relate to arch linux, but I think if you're comfortable using the terminal you should be able to figure things out.

The header bars finally see more use in 3.12; for Firefox, I'd recommend something like HTile, which removes the header when it's maximized.

there you go - https://extensions.gnome.org/extension/354/maximus/

FTFY