This needs a lot of work before it can be useful. I blame this on webextensions as they broke almost all my addons that i need. Add-on Needs queuing, Nothing like 100+ connections if downloading in bulk. Needs good resume support not the shoddy resume support that is built into Firefox natively,

Example Firefox will fail at downloading and resume won't work or it will think the file has completely downloaded and think it is finished and then you can't resume. This has been a bug for many many generations of Firefox with the default download manager. I am surprised this bug hasn't been fixed to this day. Like since the beginning almost. This is no replacement for DownThemAll.

2 stars for effort. Will re-rate if add-on improves.