add: case "cmd_openReferrer": 
context:   isCommandEnabled: function(aCommand)  {    if (!window.gDownloadsView)      return false;        var dl = gDownloadsView.selectedItem;    if (!dl)      return false;    switch (aCommand) {      case "cmd_cancel":        return dl.inProgress;      case "cmd_open":      case "cmd_show":        let file = getLocalFileFromNativePathOrUrl(dl.getAttribute("file"));        return dl.openable && file.exists();      case "cmd_pause":        return dl.inProgress && !dl.paused;      case "cmd_pauseResume":        return dl.inProgress || dl.paused;      case "cmd_resume":        return dl.paused;      case "cmd_remove":      case "cmd_retry":        return dl.removable;      case "cmd_showInfo":        return true;    }    return false;  },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10234/4e7d7cfc2013826b3f4c08e3fa605fc346eb67e6/downloads.js/clean/toolkit/mozapps/downloads/content/downloads.js