How to download the videos?
First you need a video downloader extension for your browser. You can download it on the store for your browser, for example
Chrome Store or Firefox add-ons.
Usually they are only available on desktop version.
After installation, play and immediately pause the videos on this page.
Now you can download the videos using the extension, located to the right of the URL bar of your browser by default. Note that not all videos can be downloaded.