The XULRunner project is a Mozilla runtime package that can be used
to bootstrap XUL+XPCOM applications that are as rich as Thunderbird
and Firefox. It will provide mechanisms for installing, upgrading,
and uninstalling these applications. XULRunner will also provide
libxul, a solution which allows the embedding of Mozilla technologies
in other projects and products.

This requires jdk from /extra in Slackware.

Note:
If you have to install jdk you need to run ". /etc/profile" before 
trying to compile xurlrunner.

Optional dependencies are GConf, avahi, gnome-vfs, libbonobo, and libgnome.