File:Firejailed firefox new window.png

Summary
Screenshot showing Firefox 52.4.0 (with a single window open) running inside an X11 sandbox (Xephyr + firejail, with Openbox window manager). The enclosing Xephyr window has just been enlarged, and the "New Window" item (from Firefox's 'burger stack' menu) is highlighted. 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).