>>265
windows7では表示されないみたいだな
cssで解決してる

#sidebar-splitter:-moz-system-metric(windows-default-theme){
-moz-box-align: center !important;
-moz-box-pack: center !important;
cursor: ew-resize !important;
border-width: 0 2px !important;
border-style: solid !important;
-moz-border-left-colors: ThreeDShadow ThreeDHighlight !important;
-moz-border-right-colors: ThreeDDarkShadow ThreeDFace !important;
min-width: 6px !important;
background-color: ThreeDFace !important;
}