Great Extension Rated 4 out of 5 stars
This is the best extension I have seen for FF if you want an *embedded* DL manager. Downloads are MUCH faster and I use the OnceClick function all the time.
I use this extension instead of an extension that works with an external DL manager (eg. FlashGot) because it is easier to share my settings/firefox profile between Linux and Windows. I just have to make sure to change the DL location for the oneClick.