File:Firejailed firefox filesystem protection.png

Summary
Screenshot showing Firefox 52.4.0 (with two windows open) running inside an X11 sandbox (Xephyr + firejail, with Openbox window manager). An Xterm and Nautilus window are also open in the sandbox. Outside the sandbox, a gnome-terminal window is open. Dummy files have been touched in the home directory inside and outside the sandbox, but neither is visible from the other context, thereby demonstrating firejail's filesystem protection. The main ("parent") desktop is running GNOME 3.22.2. Uploaded for use in a forthcoming mini-guide on X11 sandboxing (an addendum to Sakaki's EFI Install Guide).