1. Renters Insurance. It is always a good idea to make your tenants have renters insurance no matter what, but this is especially true in case of a fire. When a fire occurs, you both will likely lose a lot. Renters insurance can help to compensate your tenant for what they lost in the fire so that they don't try and get money from you and your insurance settlement. You will both need financial help. Make sure you are both in a position to get it.
2. Fire Detectors. I cannot stress this enough. You absolutely need to put fire detectors up in your rental property if you want people to live there. You should have them up no matter what, but it is generally the law to have them up if someone is residing in the building. These are incredibly important and should always be checked when someone moves out and before your next resident moves in. It also doesn't hurt to send your resident a regular reminder to change out their batteries twice a year. Many people do this when they change their clocks for Daylight Savings Time.
3. Escape Route. While this won't help to prevent a fire, making sure that your resident knows how to get out of their apartment or home in case of a fire is extremely important. This may just help save their life.
Helping your resident to prevent a fire is something that you should always do. While this may include going over basic fire safety rules or making sure their fire detectors work, it doesn't have to end there. There are dozens of things you can do to work with your tenant to make sure that every precaution is taken. After all, neither of you want to lose your home to something that is normally preventable.