JT
I totally agree - it is a very uncomfortable thought, not only across the Atlantic but anywhere not built up, including Oz.
Noblues
Definitely not - don't hang around at altitude unnecessarily, you may suppress the fire but not completely extinguish it. Treat any warning for real, survive it and let the experts determine the cause of the warning. Carrying an oxygen bottle with a smoke mask and then trying to carry a 32 lbs weight Halon extinguisher and extension applicator is not an easy task, and will take you away from the important job of landing at the nearest suitable airport, or ditching if absolutely necessary.