rem: aDragSession.canDrop = false; 
add: client.tabDragBar.collapsed = true; 
context: function tabdnd_dover (aEvent, aFlavour, aDragSession){    if (aEvent.getPreventDefault())        return;    if (aDragSession.sourceDocument == aEvent.view.document)    {        aDragSession.canDrop = false;        return;    }}
meta: 1622	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1622/48eaba391b8516ff6bdb5ee09bc9ea30b565a189/static.js/clean/xul/content/static.js