Nah, foof doesn’t burn, it’s destroys everything around it with hatred for the universe that made it exist.

I would absolutely expect that to be true. Generate enough oxygen, and damn near everything suddenly wants to be a gas that’s paired with it.

By itself in a vacuum, no. Under gas pressure, when contacted by water it will react from the point of contact until all reactants are complete. I wouldn’t consider the reaction to be ‘fire’ though. At least not personally. Drop some hydrocarbons in the mix and you’ll get a fire as the oxygen produced gets something to react with.

The reaction propagation is always from the ignition source to the media, so the ‘fire’ is always on the outside. Even if the inside is in the process of quickly becoming the outside.