The download button is right next to the controls of the video! Its super easy.
(All the 1 star ratings are because people click on the addon button in the Firefox menu)

Maybe I'm lucky, but for me it works just fine. Thanks to author

Works great. xqcL

It does what it says so far.

Great extension! Makes downloading clips SO much easier/faster. It recently got updated and works again!

10\10
Добавьте чтобы можно было выбирать качество для скачивания

Work very well for me, and nice integrate in the Twitch bar.