I'm comparing this to the defunct DownThemAll extension. On the plus side, downloads seem faster than normal Firefox downloads. If that's true and not just misperception on my part, then it is a good start to a download manager extension. What I would like to see in the future is a visual representation of how many sessions are open on the download. It would be nice to be able to add mirror sites. I would also like to see a built in hash verifier (MD5, SHA-1, SHA-256, etc.).

To the extension developers, good work filling a need. Now it's time to add some wow factor.