it discovers audio, but unfortunately sucks with blob:https//... video handling.
in other words, it tries to do things VLC does best way.

Youtube = no work nuff said it's crap addon

now it finds nothing
FF 132.0.2 x64

Находит, но скачивает только то, что загрузилось и к тому же отдельными файлами, это же можно сделать штатными средствами, так зачем перенагружать браузер ненужным расширением?

Did not work

Doesn't work at all - nothing on a toolbar.

Didn't work on Youtube but worked like a charm on whyp.it

It does not detect audio on the page.
Amen.

Does not detect audio on lernen.goethe.de

Doesn't work with Vkontakte. That's sad...

Breaks down video into multiple few second videos without sound and multiple audio files. Not sure how this would be useful to me in any way.