Come to think of it, with all the strict laws in Singapore and all, would I get into trouble (jail/arrested) if I opened a flight door as a pax in this situation?
Simply trying to save my life?
Can't answer for Singapore but if, by opening the door,
you caused the fire to spread, burnt the slide and people died, all as a result of
your action, I think you will certainly be called to account in the USA, not just in the criminal court but also the relatives would be queuing up to sue you!
I mentioned in an earlier post that it is highly likely that the crew were in contact with the fire fighters and it is quite possible that the decision not to evacuate came as a result of what the fire fighters could see and the crew, (and pax), couldn't.