FlashGot is a free Mozilla / Firefox / Thunderbird extension, meant to handle single and massive ("all" and "selection") downloads with several external Download Managers.
FlashGot is an extension that handles internet downloads with external download managers.
Flashgot works with the following Download Managers:
FlashGet - Feature-rich manager for download
Free Download Manager - Full-featured download accelerator and manager
Fresh Download - Easy-to-use and very fast download manager
Internet Download Accelerator - Accelerates your download speed
GetRight, HiDownload InstantGet,LeechGet,Mass Downloader, etc.