Navigation widgets benefit from a few of Mozilla's style extensions.
The -moz-appearance style extension supports native themes for stylable widgets. Some values are applicable to the XUL tags described in this chapter:
toolbox toolbar statusbar statusbarpanel progressbar progressbar-vertical progresschunk progresschunk-vertical tab tab-left-edge tab-right-edge tabpanels tabpanel scrollbartrack-horizontal scrollbartrack-vertical
Mozilla supplies the CSS2 overflow style property with some very handy alternatives as shown in ...