No button appears so not working

On my system and firefox, no button appears. Has youtube made these kind of extensions 'impossible'? Btw. Firefox 108.0, Linux PopOS. I turned off all Adblockers and no-script extensions. The button is NOT emerging. So sadly I have to give it a 'one' star. I am still looking for an extensions that works. I also tried other mp3-downloader button-extensions, and never the button appears.

YT says I can't use it to download even low-quality MP3 files. Uninstalling, sorry.

Don't work.

doesn't working

All the downloads give a malware signal with virus. Toadas las descargas dan señal de malware.

Does nothing. No button to download is added to a youtube page like it claims but is running in the background at all times.

No button, doesn't work.

dead...like all .mp3 downloaders

doesn't work