Edit of GNOME 3's Adwaita Metacity theme to remove the titlebar when the window is maximized. Source: https://gist.github.com/ajashton/1258443 sudo gedit /usr/share/themes/Adwaita-X-dark/metacity-1/metacity-theme-3.xml and edit the file manually according this patch: diff --git a/metacity-1/metacity-theme-3.xml b/metacity-1/metacity-theme-3.xml index 0 e 285 a 9 .. 52 d 8 c 54 100644 --- a/metacity-1/metacity-theme-3.xml +++ b/metacity-1/metacity-theme-3.xml @@ -46,17 +46,14 @@ <distance name="right_titlebar_edge" value=" 1 "/> </frame_geometry> -<frame_geometry name="max" title_scale="medium" parent="normal" rounded_top_left="false" rounded_top_right="false"> +<frame_geometry name="max" has_title="false" parent="normal" rounded_top_left="false" rounded_top_right="false"> <distance name="left_width" value=...