I have tried several add-ons for downloading videos. This one works for me! For now, I still have to come across a video that cannot be downloaded.
Having installed the companion software really makes this add-on a charm.

Funciona muito bem em diversos sites. Satisfeito com o resultado.

Very easy to use and very reliable for downloading videos that one cannot simply right click to download.

I have been downloading my videos with it for years. The best tool until now.

ottimo componente aggiuntivo di firefox, esegue il download della maggior parte di video online

Das Ad-on funktioniert einwandfrei, besser als anderes, was ich bisher verwendete

このアドオンなくして私のfirefoxライフは成り立ちません。本当にありがたいです。

NB Plus

niu b，very good！！

I love it, it does what i need it to do.. YMMV

Très satisfait de ce module :)

Meist gute bis sehr gute Arbeit. Doch bei manchen Plattformen funktioniert es nicht oder ungenügend. Hat sich leider nicht geändert.

Excelente

As an online student I love this app ... I download course videos to watch later when I am offline. I find the occasional video I can't download - but 98% of the time it is golden!