Yikes! Looks as if they just changed the color of the breakers. It wasn't the "stab" part that caused FPE breakers to be so dangerous. It was the fact that they wouldn't trip!
I seem to recall that their skinny two-pole breakers couldn't occupy a space on the same leg. It has been a while since I've encountered an FPE panel around here so I can't speak with certainty.
