XUL

from The Free On-line Dictionary of Computing (8 July 2008)

XML User-Interface Language
XUL

   <language> (XUL) An {XML}-based language created for the
   {Mozilla} {browser} for development of {cross-platform} {user
   interfaces}.  XUL supports input {controls} such as
   {textboxes} and {checkboxes}, {toolbars}, {menus}, {dialogs},
   {trees}, {keyboard shortcuts}, and more.

   XULPlanet (http://xulplanet.com/).

   (2003-06-14)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

XUL
       XML-based User interface Language (XML, Netscape, Mozilla, AOL)