"Napalm" is usually considered as a weapon. What you meant is probably just "emergency firestarter", or as I would call it, turbo-tinder :D
I personally prefer using cotton pads, that are soaked in liquid candle wax. When it's cold, it hardens and the whole pad gets stiff and hydrophobic.
Instead of having to lift a glass jar, you can just slip a few of those discs into your pocket or a small bag.
And because the wax is hard, you don't have to worry about storage, and they will stay that way forever. With your polystyrene goo, you have to remember that the jar will never be 100% gas tight and it will evalorate over time.
The pads even work when wet (because they won't get wet) and can be used with a ferrocerium rod.
Also, styrofoam releases toxic gases when ignited, wax won't.