This is a complete guide to Fire Fighter job in Grand Theft Auto.
You can get the firefighter job from the location on the map which is marked as a red fire icon. You will need to go there.
Go into the firefighter building, then go to the yellow circle and get employed.
You have to wear a uniform and rent a firefighter truck for 300$.
Once you rent a truck, you have to press J.
After that, select the route to fire whichever fire you wanna go to extinguish. Then go to the location and finish the job. At level 1, you’ll get 250$ for extinguishing one fire. Make sure you don’t run out of rentals, so don’t waste time.