The only download manager I've come across that properly integrates with Firefox (e.g. can handle cookies/referrer URL when choosing to download a link from within Firefox). The user interface is a little bit unusual (I'd prefer a standard list view with columns etc., and the lack of a title bar on the window makes me uncomfortable), but overall this is the the most reliable and useful choice I've found (particularly in the absence of Down Them All for Firefox 57+).
Huh. I don't know where it came from or how it installed, but Folx....free not pro....came from somewhere. MacUpdate is the only 'download' software I use so it must have been from here. I don't like that one bit. I will update it to pro though if you folks can tell me how well it downloads at night while I am sleeping up here in the woods with a s l o w satelite called Hughsnet...and yes its their new sat. Thanks for info kids.