Missing word in string: «Why is disabled by default?»

[Mathias Bynke]

This string: https://translations.launchpad.net/gui-ufw/gufw-13.10/+pots/gufw/nb/73/+translate reads «Why is disabled by default?».
Reading the next string («By default, the firewall does not open ports to the outside world.») I assume that it refers to the firewall or Gufw. I am not a native English speaker, but «Why is _it_ disabled by default?» (with «it») sounds more natural to me. «Why is the firewall/Gufw disabled by default?» would possibly be even better.