Hi!

There are quite a few video downloaders which are compatible with Firefox Quantum. I'm sorry if your favourite isn't included - but maybe you can find a different one you like?

https://addons.mozilla.org/en-GB/firefox/extensions/download-management/

As you know, there have been massive changes in Firefox Quantum to make it look and feel faster, and this means some addons no longer work. But there are alternatives and replacements for many addons. You'll find more info here: https://blog.mozilla.org/addons/2017/10/26/helping-find-compatible-extensions/

Cheers.

This download manager works separately from the browser. The browser tells it what to download, and off it goes.

http://www.freedownloadmanager.org It is a powerful modern download accelerator and organizer for Windows and Mac.