Have a big can of good brand fire extinguishing spray (it's smaller than a fire extinguisher and easier to use, not that fire extinguishers are hard to use, I used dry powder and carbon dioxide snow ones no problem during training) handy and don't leave electric lights unattended on Christmas trees I guess?

For more horror (and to become scared of windows and doors during a fire) see: https://en.wikipedia.org/wiki/Backdraft