if (visibility) gtk_widget_show_all(browser->topLevelWindow); else gtk_widget_hide_all(browser->topLevelWindow);
set_browser_visibility(browser, visibility);
visibility_cb (GtkMozEmbed *embed, gboolean visibility, TestGtkBrowser *browser){  g_print("visibility_cb %d\n", visibility);  if (visibility)    gtk_widget_show_all(browser->topLevelWindow);  else    gtk_widget_hide_all(browser->topLevelWindow);}