Physical location of DOM:Storage

I'm developing a stand-alone XULRunner app. For storing various bits
and pieces across sessions I make use of DOM Storage (see
http://developer.mozilla.org/en/docs/DOM:Storage). It seems to do what
I want and I'm delighted. But I'm curious, where does data passed to
"globalStorage" get physically stored? Does it get written to a file
in the user home dir? I want to know :)

~ Vladimir