Which library does Firefox use for its user interface and can you use it in other applications?
Xul
http://www.mozilla.org/projects/xul/
and
http://en.wikipedia.org/wiki/XUL
Firefox uses XUL to define its user interface and displays it using Gecko .
Since Gecko is open, you can really use it to render your application, although I donβt know how simple such an interface would be.