https://www.emacswiki.org/emacs/
Changing the (buffer) menu fonts for GTK emacsAccording to http://stackoverflow.com/questions/3454466/emacs23-buffer-menu-font-gtk say in ~/.emacs.d/gtkrc:
style "menufont" { font_name = "monospace 10" # Pango font name } widget "*emacs-menuitem*" style "menufont" Using widget "*" ... will change all “toolkit” fonts (menus, dialogs).A