There's a fire extinguisher furniture item, and I'd think it'd be neat if you could smash open the case and use the fire extinguisher to smother the flames.
Maybe the fire extinguisher could also inflict freezing when shot at killable NPCs as well, on account of the CO2 being super cold.

If this does get accepted, probably should make the fire extinguisher craftable as well, though not a necessity by any means.