xulrunner 1.8.1.18+nobinonly.b308.cvs20090331t155113-0ubuntu0.7.10.1 (sparc binary) in ubuntu gutsy

 XULRunner is a single "gecko runtime" that can be used to bootstrap
 multiple XUL + XPCOM applications that are as rich as Firefox and
 Thunderbird.
 .
 XUL is Mozilla's XML based User Interface language that lets you build
 feature-rich cross platform applications. These applications are easily
 customized with alternative text, graphics and layout so that they can be
 readily branded or localized for various markets. Web developers already
 familiar with Dynamic HTML (DHTML) will learn XUL quickly and can start
 building applications right away.
 .
 XPCOM is a cross platform component model. It has multiple language
 bindings and IDL descriptions so programmers can plug their custom
 functionality into the framework and connect it with other components.
 .
 Homepage: http://developer.mozilla.org/en/docs/XULRunner