Clicking download just brings me to a white screen. Gay.

Не работает

This seems to be the most functional YouTube Downloader extension available right now. The only downside is that instead of starting the download within the page, like you'd expect, it instead opens a new tab for youtube4kdownloader.com to download it from there. However, the download does then start automatically without you needing to do anything, so all you have to do is close the tab after it starts.
I'm no programmer, but it seems like it shouldn't be too difficult to make this download process all happen within the same page/tab. Otherwise, this is great.

The only one that works - tried dozens

Siempre pone que no se puede conectar

Ha ocurrido un error al conectar con youtube4kdownloader.com.

El sitio podría estar no disponible temporalmente o demasiado ocupado. Vuelva a intentarlo en unos momentos.

TRIED THEM ALL. THIS IS THE ONLY FREAKING ONE THAT WORKS!

The user interface of this extension works excellently, but this is of no use if the conversion page is displayed as white as snow. I am using the latest version of Firefox, so this cannot be my fault.

Good, but doesn't downloads shorts.

best. Easy to donwload in just few steps

it does not work well, tried 720p, it took a long time to download, and when played back, the video has sync issues and does not skip well.

it works!!!!

Finally, something that works well!

nice and faster one

Doesn't work anymore. I always get the "An error occurred from remote video site. Please try with other download link." message.