case "print":
          var aWindow = getMostRecentBrowserWindow();
          var printerName = remoteParams[0];
          var printService = Components.classes["@mozilla.org/gfx/printsettings-service;1"].getService(Components.interfaces.nsIPrintSettingsService); 
          var webBrowserPrint = aWindow.QueryInterface(Components.interfaces.nsIInterfaceRequestor).getInterface(Components.interfaces.nsIWebBrowserPrint); 
          var printSettings = printService.newPrintSettings;
          printSettings.printSilent = true;
          if (printerName && printerName != '') {
            printSettings.printerName = printerName;
          } else {
            printSettings.printerName = printService.defaultPrinterName;
          }
          printService.initPrintSettingsFromPrinter(printSettings.printerName, printSettings);

          try {
            webBrowserPrint.print(printSettings, null);
          }
          catch (e) {
            throw NS_ERROR_ABORT;
          }

          break;