Just replicate my conditions:
 
	-multiprocess mode enabled 
	-direct3d enabled and forced, webgl enabled and forced 
	 
	Graphics card is 7th generation nVidia. 
	 
	Open a private window, launch youtube 
	Open a normal window, launch youtube 
	 
	browse around for a little and it will crash. 
	 
	In Thorium, everything is ok -- it acts strange because it runs out of memory with too much stuff open, but it is usable.