I thought I would start simple with this extension since the reviews show widely varying experiences. One very simple page, containing 16 links to text files. I clicked the download arrow, answered yes to the "do you really want to do this" dialog, and watched as my browser opened separate Save dialogs. I was expecting this even though it is senseless, but what I was not expecting was to begin clicking Save on each window only to see it replaced by another Save dialog for the same file. Over and over and over and over.
So I quickly hit Cancel, Cancel, Cancel, Cancel, Cancel, etc to make it stop. It eventually stopped opening duplicate Save dialogs but clearly there are some really big bugs in this one. Back to clicking single links.