[skaomatic]

There's nothing to fix. The fire is either of a type that may be extinguished and a trained firefighter decided to put this type of fire out for everyone, or the fire is unable to be extinguished as was the intention of the entity that started it.

If it's the former, find the correct firefighter, if it's the latter, use a different fire.

[AnthonyMouse]

There's nothing to fix. The construction material is either of a type that does not spontaneously combust, and a carpenter can make you a fine chair out of it, or the material is the type to spontaneously combust, and if you choose to buy a chair made of that material you will soon find your pants are on fire.

If it's the former, pay a contractor to build you a chair, or make one yourself. If it's the latter, use a different construction material.

[basementcat]

There is nothing to cure. The pathogen is either of a type that is curable, and a licensed medical professional can prepare a treatment regimen, or the pathogen will liquefy all of your internal organs within minutes, and if you choose to expose yourself to the latter pathogen, you will find yourself having a bad day very quickly.

If it's the former, pay a licensed medical professional or read online forums and do it yourself. If it's the latter, contact your nearest funeral home.