Rated 5 out of 5 stars
After tinkering with this add-on for almost a year now, I gotta say it's one of my all time favorites.
One thing to note though, I have a less than stellar internet connection, so whenever I download anything I find myself looking at the download progress bar quite a bit. After a while I realized that it's kinda small and difficult to read/gauge.
I don't know how hard it'd be, but it'd be really awesome if you could make the entire arrow light up and move from top to bottom to simulate progress. Much more visible and looks neater than a small bar at the bottom.
One more thing: there's no option to have text appear only when there's a download. It's either always visible or never there. An option to amend that would be nice too.
Otherwise, this is probably the best add-on functionality-wise. Very useful and customizable and I'm never taking it off of my FF xD