Rated 4 out of 5 stars

This addon is supposed to increase download speed up to 4x, but I never see any speed increases on my Cable internet connection. I haven't tested it yet, but it would probably bring small speed increases to lower speed internet connections. The DownThemAll feature of this addon is awesome. It allows the user to download all links, images, etc, from a single webpage. Very useful. To wrap up my review of this addon, it is great as a download manager, but not so great as a means to speed up your downloads.
^4

This review is for a previous version of the add-on (2.0.7). 

Amazing, Fast Rated 5 out of 5 stars

This is the fastest download manager out there for Firefox. Especially good for large files. Increased download speeds about 200% on my connection.

This review is for a previous version of the add-on (1.1.0).