It uses a online service to do what should be done locally (look at the permissions). Furthermore it didn't work for me. The UI is good but it is an empty shell.

Links to a website, and nothing more.

That website produces a totally white screen, but does start the download. However, it doesn't say that it's doing that, and the download doesn't say how big it'll be (no percentage). This is bad hosting practice on their end.

Therefor this will get more stars if it's better integrated, gets better UI, and shows any type of progress.

provoque de sérieux problèmes de lecture sur certains fichier quand les tag ID3 sont modifiés, sinon très bon module

Doesn't appear to work properly anymore: only offering 320p and video length of 5 minutes only. Even if I go directly to youtube4kdownloader.com and paste in the video url.

In general it works, but each time opens new tab so after downloading series of video you get this blank tab polluting your tab line. Sometimes it does Not downloading high resolution videos 720,1080,1440p and 4k, as claimed leaving you blank tab that does nothing, so you have to redownload lower resolution video. And last but not least, the most frustrating is that it sometime opens a new tab with video wich suddenly deafens you on full volume and you have manually save the video from this tab changing its default name "videoplayback.mp4" every time. Would be nice to fix this issues an if it is managable - to give an option to download several chekmarked videos from playlist/searchlist/recomendations.

upd:some uhd videos dowloaded broken