FlashGot is a free add-on that integrate Firefox with external download manager.
1. FlashGot Link (contextual menu or Ctrl-F1 or Alt+Click on a link) - downloads through the default download manager the link under the mouse pointer. 2. FlashGot Selection (menu or Ctrl-F2 or Alt+Click with an active selection) - catches links in hilighted text/images, attempting also pure text to anchors conversion, performing some "smart" replacement like turning "hxxp://" into "http://". Many download forums list links to password-protected archives (usually RAR or ZIP), followed by an indication of the password to open them. If you select the links and the password by dragging the text selection with your mouse, and then you use the FlashGot Selection command, the password will be passed to the download manager inside the description of the links, so you can easily retrieve it when the download is completed with no need to annotate it manually. 3. FlashGot All (menu or Ctrl-F3) - grabs all the links found in the current page and dispatches them to the default download manager, which could offer an easy interface* to filter and select the file that will be downloaded in a batch. * built-in filter dialog is provided by every Windows/Mac OS X download manager except GetRight and cURL. On Linux, your best open source