Switch to Preferences.jsm.
Switch to Preferences.jsm.

It's cleaner and simpler due to the type inference which we already
use, so let's stick with one approach. Also the explicit default
values make stuff clearer.

ioerror/torbirdy,u451f/torbirdy,u451f/torbirdy,infertux/torbirdy,ioerror/torbirdy,infertux/torbirdy,kartikm/torbirdy,kartikm/torbirdy