The window panes did melt, or at least deformed and shrunk. That's how they departed the aircraft. The mentioned foam is on the inside of the cabin liner. The

The window panes did melt, or at least deformed and shrunk. That's how they departed the aircraft. The mentioned foam is on the inside of the cabin liner. The interior walls that line the actual pressure hull. The foam seals role is probably noise and vibration reduction, not pressurization.