This problem (freeze of download panel) also occurs in Firefox ver.95.0.2. Youtube may have changed the specifications.

(Translated into English by Google Translate. I'm sorry if the nuance is wrong)

非常好用

Loving this downloader! 2 clicks and it begins, and is relatively quick!

The downloader has gotten slow lately because of Google’s recent changes. The VLC developer fixed it when using their youtube.lua playlist script that lets you watch the video in the player instead. It also provides a direct link to the video and it downloads the 360p mp4 in seconds.

bit slow, but downloud withou annoying ads

Great!!!

useful

Me ha resultado de mucha utilidad, práctica e intuitiva herramienta para descargar videos en varios formatos y resoluciones.

The only plugin that always worked for me since I can remember.
I only use it to exctract the audio from YouTube videos preserving the original quality, and it does it PERFECTLY.