I donated way back when this was being developed. I'm happy I did, because I've used it ever since. There are other downloaders I have tried, but I still keep staying with DWHelper (DownloadHelper). It has continued developing and updating through the years. Lots of conversion options. Use their own downloader, or your browser to download a file.
One thing I am missing, is how to download a large video file (movie) when it is broken up into hundred of small files.

this add-on is super useful and it's free! Good job devs :)

Uma das melhores extensões! Mão na roda e salva várias vezes!

One of the best addons I ever used. Easy to use and very helpful!

Estensione facilissima da usare che ti permette il download immediato da molte piattaforme musicali, veramente comoda!

This piece of software requires a companion app download. But, by far the best video download helper on Mozilla Firefox. I have not had similar success with Google Chrome or Microsoft Edge browser, in using this tool there. But, with Mozilla Firefox, this works best.

非常好用，一般的直播都可以download，希望后续版本能抓取微信小程序里面的内容

In my experience, this downloader is the most useful one that I have experienced. I have several on my computer and this one is consistently able to harvest the video from the websites. I am eager to get the premium one as I have used the hell out of this extension. They have certainly earned my patronage. I don't have the money right now, but I want to encourage anyone who uses this code to support it. If I had an income I would invest in this product and this company. I am grateful and wish to extend my thanks and my appreciation to the developers and the community that supports them.
I wish that it worked on my phones firefox browser. I have not been able to get it to load or work on my Samsung Note 9.

Outstanding tool. Works well.

Un add-on que casi nunca falla, muy fácil de usar y efectivo.

It's very helful to download for any video from web. I reach 300th video. Thank you.

İTS VERY GOOD WORKİNG.

This is the most powerful and convenient video download tool that I have used with Firefox and Internet Explorer! Thank you, mig!

Очень удобное приложение, использую для себя, когда надо посмотреть вебинар в удобное мне время.

下载youtube试了好多次，每次都是卡在汇总中。不好使！

Very clear algorithm to use, it is possible to choose the extension of the downloaded video. Thank you to the developers for such help.