This addon either needs retiring or taken over by another developer, as clearly the current dev has no time to fix its bugs. Its not the first time either.

Its not combining most videos, and hasn't been for months. 1 out of 4 videos might combine, but with it downloading videos as slow as it does, who the hell will try 4 times for a successfull combine.

Other competitor addons exist, and they work on youtube + many more video sites.

stopped combining audio-video files

The add-on stopped combining video and audio for me beginning around Oct. 19, 2022.

It stopped combining video and audio from October 19, 2022. But the number of users is still increasing, why?

pierdyliard aplikacji pobocznych niezbędne, by pobrać mp3

I don't even see the button appear on the toolbar and I can't install it. nothing works

Best one out there. Just click the download panel and select whatever webm quality you prefer (720p is decent enough).
You'll get both the audio and the video files, cancel either one to cancel both downloads and download them again, it should download like x50 faster. You can even cancel the video download after the audio download is done, if you only care about the audio.

8/10 times download stops unexpectedly, even at the end - after 100s of MB came in already. No file can be found. Often, cannot detect the video file. This piece of crap needs a lot of fixes before going out.