A sad picture for sure but this beautiful '56 Ford Thunderbird was part of our club caravan on the way to Cumberland Gap, Tennessee on June 22, 2013 when the rear brake started to "hang up" and before being noticed, a major fire started in the back wheel and in less than 20 minutes the T-Bird was reduced to a total loss.
The question isn't so much a discussion on whether a fire extinguisher would have made the difference but rather where it should be located in the car.
Most people carry an extinguisher but it is usually in the trunk. In this case it would have not been accessible as the fire started in the rear of the T-Bird and quickly consumed the vehicle.
Probably best to carry the right kind of extinguisher in the driving compartment, behind the seat of the driver for faster access. In this case, however, it is doubtful if it would have made any difference. Truly a sad story!