XDG-URL on Kali

Hey guys,

Is it possible to get xdgurl on Kali Linux? I was reading a tutorial on how to “theme up” my Kali and they recommended I use gnome-look.org. My problem, however, is I can’t install the tar.gz file because Firefox couldn’t understand the xdg URL. I’ve spent at least 3 hours now trying to find out how I can use xdg URLs on Kali so I can download a new theme for it.