download manager for Firefox
DownThemAll! is a powerful yet easy-to-use Mozilla Firefox extension with advanced download capabilities. It lets you download all or some of the links or images contained in a webpage. And it features an advanced accelerator that increases speed up to 400%, it allows you to pause and resume downloads at any time and, last but not least, it's fully integrated into your favorite browser.
Extension Homepage: http://www.downthemall.net/