Greasy Fork is available in English.
Download YouTube videos. Video formats are listed at the top of the watch page. Video links are tagged so that they can be downloaded easily.
Okay, it seems sig messages are fixed on a webpage refresh (weird that they used to not be back when I wrote the above). But the download speeds are very low, especially on 4K videos. 220 KB/s is just not enough when the YouTube player gets more, at least on video.
Have been using this for a bit more than a year. It started getting sig-108 on this video: https://youtu.be/iap1wgxsKHc
Please update the script.