What this addon allows you to do is change the default download folder via the right-click context menu, for example I have most my downloads go to my tiny SSD, if I'm downloading something big like a movie, I can quickly switch it to my external drive for that file, then back to my SSD for other downloads, time saver! :)
yeah same from me, i am quite surprise why it doesn't get more downloads . but we have been working for other improvements and i think that add-on will rise its popularity highly once its fully approved. till then , hope for good.