return NS_OK;
return rv;
XULPopupListenerImpl::Init(nsIDOMElement* aElement, const XULPopupType& popup){  mElement = aElement; // Weak reference. Don't addref it.  popupType = popup;  // fetch the tooltip display pref and register ourselves as caring if  // it changes.  if ( popupType == eXULPopupType_tooltip ) {    nsresult rv = NS_OK;    NS_WITH_SERVICE(nsIPref, prefs, NS_PREF_CONTRACTID, &rv);    if ( prefs ) {      rv = prefs->GetBoolPref("browser.chrome.toolbar_tips", &mShowTooltips);      prefs->RegisterCallback("browser.chrome.toolbar_tips", (PrefChangedFunc)sTooltipPrefChanged, this);    }  }    return NS_OK;}