function plt_hide_favicon_by_realfavicongenerator_menus() {
//Hide the "Appearance → Favicon" menu.
remove_submenu_page('themes.php', 'fbrfg_favicon_appearance_menu');
//Hide the "Settings → Favicon" menu.
remove_submenu_page('options-general.php', 'fbrfg_favicon_settings_menu');
}
add_action('admin_menu', 'plt_hide_favicon_by_realfavicongenerator_menus', 11);