I am so sad this extension doesn't work anymore.... It worked so well before.. I used it for the same reason the developer did, I listen to music on Youtube, just running audio saves bandwidth and RAM...

I will still leave my orginal comment here as a reference... so sad...

I love this extension.
Very simple, grey its off, Red it's on. I put the icon next to the search box, just a click to toggle on/off.
Youtube loads much faster with it as well. perfect for music and audio books.
=)