I don't. I think paying for firefighters should be voluntary. Either I pay for it individually, or as part of my neighborhood, or at some other level that's much closer to me.
If I don't want to protect against my house burning down, why should I pay for it? And before you go and say, "because your neighbor's house could burn down too", they could choose to pay for firefighters and have them come out to douse my house in defense of their own.
How do you justify those whose property isn't on fire paying for firefighters?