I tried this as a replacement for DownThemAll. It works only in theory, as there is one huge problem: the option to set one default folder for all downloads doesn't work. This means that the addon will open one "Save file as..." dialog for each file, and you have to navigate to the target folder for each file separately.

If the "Ask for one foder name for all files" is fixed, this will be a 5-star addon for me.