Neat concept, but I don't see a VirtualBox-based implementation ever becoming mainstream... not that it needs to be mainstream to be useful. It seems like full

Neat concept, but I don't see a VirtualBox-based implementation ever becoming mainstream... not that it needs to be mainstream to be useful. It seems like full blown x86 PC hardware emulation is overkill for what you're doing. As others mentioned, NaCL isn't really the right abstraction layer either. Perhaps a stripped-down version of VirtualBox could be turned into a "standard" browser plug-in and paired with something like Docker, so you're just running a minimal container image.