I have the same issue with numbers in IceCat. I have tested both inside and outside a VM and with Gnome, XFCE, Enlightenment and EXWM. It seems, if I don't have
(service gnome-desktop-service-type) in my config, numbers in IceCat are shown as long spaces. I don't have the problem, even when using XFCE, as long as that line is in my config. I hope this can help someone find the problem. Thanks. -- Christian Bertram