general.php

add_action( 'wp_before_admin_bar_render', 'jb_admin_bar_items' );
/**
 * Customize Admin Bar Items (add Plugins)
 */
function jb_admin_bar_items() {
	global $wp_admin_bar;
	if ( current_user_can( 'activate_plugins' ) )
		$wp_admin_bar->add_menu( array( 'parent' => 'appearance', 'id' => 'plugins', 'title' => __('Plugins'), 'href' => admin_url('plugins.php') ) );
}