add: window.opener.getBrowser().hideMessage(window.opener.getBrowser().selectedBrowser, "top"); 
context: function wizardFinish(){  // don't refresh if no plugins were found or installed  if ((gPluginInstaller.mSuccessfullPluginInstallation > 0) &&       (gPluginInstaller.mPluginInfoArray.length != 0) &&       gPluginInstaller.mTab) {    window.opener.getBrowser().reloadTab(gPluginInstaller.mTab);  }  return true;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/1e1713e9b5d02069be004fb290e443fad37908d4/pluginInstallerWizard.js/buggy/toolkit/mozapps/plugins/content/pluginInstallerWizard.js