So this is basically my response to this that I received from a "developer" in response to my first review:

"Have you ever thought that if you download with the companion app, there is no reason (and no possibility) to see the download in the browser download manager ? And that if you see incoming data, there is a video file created somewhere in your disk, like at the default download location of the add-on that you can configure through several ways.
I suggest you check the support forum https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!forum/video-downloadhelper-q-and-a"

To answer the question, yes, I considered, that. I rejected it as bad design. The download queue in your "add on" is jenky at best, hard to get to, and fussy as all hell. Firefox has a perfectly good download manager, I'd much rather see stuff there, like it used to be. If you have an issue with the new, but hardly improved Firefox API, then that's between you and Firefox.

Second, yes, I checked the default locations. I'm not quite as stupid as you seem to think. When I said it wasn't there, I meant it. It's not there. I'm not going to go hunting on the disk for a file that may have been created in some random place. If you did and and I caught you doing it, you'd have gotten an entirely different review the first time and you'd have been flagged as abusive.

I continue to search for a solution that works, but it sounds like you need to really embrace the new Firefox API and refactor the program rather than trying to make it work like it used to.