Put some time in on firejail recently, see http://unix.stackexchange.com/questions/...vpn-client

Currently typing this in a firefox firejail sandbox with network isolation (--net=...) and a private chroot dir, Xpra viewer.

I'd be happier with Xephyr - would have to configure a window manager for window resizing to work, also though Xephyr has no clipboard code built in (Xpra can be configured to copy the clipboard in and out). Running firejail without disabling the X11 abstract Unix socket (which would enable the native X11 clipboard) defeats the object. I could do to find a solution to this, an optional viewer would be useful.

Apart from Xpra and Xephyr, are there any other remote viewers out there?