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Here are some ideas of how to sandbox an application. Could be used for any application, not just gngr.
gngr
The simplest way to sandbox an app is to run it as a separate user in your operating system.
This takes a little more time to setup but is safer. You can use tools such as VirtualBox or lxc to create virtual machines.
VirtualBox
lxc
Apart from that, here are some packaged solutions: