add: return true; 
context:     onDragStart: function (aEvent, aXferData, aDragAction)    {        var currentIndex = gHistoryOutliner.currentIndex;        if (isContainer(gHistoryOutliner, currentIndex))            return false;        var url = gHistoryOutliner.outlinerBoxObject.view.getCellText(currentIndex, "URL");        var title = gHistoryOutliner.outlinerBoxObject.view.getCellText(currentIndex, "Name");        var htmlString = "<A HREF='" + url + "'>" + title + "</A>";        aXferData.data = new TransferData();        aXferData.data.addDataForFlavour("text/unicode", url);        aXferData.data.addDataForFlavour("text/html", htmlString);        aXferData.data.addDataForFlavour("text/x-moz-url", url + "\n" + title);    }
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/a3e409704cfb79c0267c0c73b43f1ccb3726d295/history.js/clean/xpfe/components/history/resources/history.js