I was a bit unsure about using this latest iterration as the downloads no longer show up in ther main Firefox download page -but it does seem pretty reliable once the Download Helper coap is installed. The 9.0.2.12 version seems in practice an improvement - though individual download records now have to be removed from the app pop-up indiviually rather than the Firefox dowload page in en masse.
I notice this version will download Twitter (X) video files, though you have to be careful to select the right fule to download.

Easy to use. Download folder can be selected

Hands down the best video downloader out there. Usage is straight forward and any conversion is seamless. Video DownloadHelper works on every site I've needed to use it.
UPDATE 1 year later: still the best, still love it 🙂

Très bonne application, pratique et efficace

la meilleure appli pour download des clips !

Great stuff! Works very well on more sites than any other doewnloader I have tried.

Fantástica actualización gracias

With the new extension showing the bars on the side and the progress it is really easy and super to handle.

Schnell und einfach zu installieren und die Anwendung klappt super. Ich sehe keine Nachteile.

Отлично качает с vk.com. Убрал много головной боли.

great

Mostly smooth and easy. I have been using this for many years, and I will continue to use it.

This is a great and useful add-on. Works like a charm!