rem: var url = retrieveURLFromData(aXferData.data, aXferData.flavour.contentType); if (!url) 
add: var url = transferUtils.retrieveURLFromData(aXferData.data, aXferData.flavour.contentType); if (!url || url.search(client.linkRE) == -1) 
context: function tabdnd_drop (aEvent, aXferData, aDragSession){    var url = retrieveURLFromData(aXferData.data, aXferData.flavour.contentType);    if (!url)        return;        if (url.search(/\.css$/i) != -1  && confirm (getMsg("tabdnd_drop", url)))    {        onSimulateCommand("/css " + url);    }    else if (url.search(/^irc:\/\//i) != -1)    {        gotoIRCURL (url);    }}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/04ee09cffc1a18a94adb0e62cc85bd73c4db50fc/static.js/clean/extensions/irc/xul/content/static.js