I just open your Media soup Demo(mediasoup demo) from windows machine and it just restart the system, also i tested with i3 and i5 intel processor both processor has same results with Media soup demo.
Machine Configuration :
OS : Windows 10
Processor : i3 and i5 intel
It is surely something else which is causing crash because how can a website cause OS crash? May be your browser is not up to date or as per your machine. You may have to check crash logs to better get the idea.