Asklemmy

Eh, FOOF is so unstable that it's very hard to make enough of it to do any real damage. It's also just very hard to make. It's only remotely stable at cryogenic temperatures, and is so reactive that without an inert atmosphere it will rapidly decay into something more stable. Granted, it will do so by oxidizing the molecular oxygen in the air (which is as insane as it sounds) and release a ton of energy in the process but assuming you don't already have a bunch of it, you won't be able to create enough of it fast enough to do any meaningful damage without a specialized laboratory and associated equipment.

Chlorine Triflouride however, can be made in your kitchen, and is just stable enough that, assuming you've taken some precautions, it's possible to accumulate enough of it to immolate yourself in one of the worst possible ways.