They are often around when fires break out and they repair the aftermath. So why not give them fire extinguishers and firefoam grenades?
Bonus points if they have a financial incentive to start fires themselves.
1) A duplicated and renamed shovel (call it a halligan bar or whatever) that lets someone use the extinguish verb (maybe with a bonus) when a fire is at it's largest size.
2) Fabric material that costs something like 1500-4500c a bolt, has no appearance scores, but is flagged as fireproof (in terms of the clothing burning, not the character).
It allows people to possibly repurpose and use their company gear for personal advantage, or even medical people to get some access to air protection when Hazmat helmets do not exist, and they dont wanna slunk around some xo5.
Plus, firefighters are hot.
Dealing extremely high fatigue damage would also give a reason for characters to be rescued by others, while still having the fire be not actually all that lethal in practice.