55 Seconds from Touchdown on an ILS.....are you guaranteed to break out and land?
If at the Standard DH....insufficient visual cues were not present would you (a) continue the Approach until you either saw enough runway to land or had to make a late Missed Approach Procedure or (b) executed a Standard Missed Approach and deal with the Fire situation during the Climb Out?
I consider having a real Fire an Emergency Situation thus there is nothing "normal" about that....and as the PIC....I have certain discretions available when it comes to my decision making.