Works great..

I suggest to notice this addon is not for Android. This help to avoid wasting time to try on Android.
Thank you.

as said, only downloads audio stream... thanks

Can you make it work for android?

I gave 3/5... will you make it work on Android? I tested it on Lollipop 5.0 It doesn't show that watermark like in PC. I tried also "desktop mode" for mobile devices and still the same.

Actually it works. Don't know about net traffic, but I needed it for a very old eeePC which would go crazy hot. Now it is just fine.

Checked the source code, it actually downloads only the audio stream. The video stream is removed ( not downloaded at all ) from every stream that is played when then extension is activated. Confirmed from the network pane.

Loved that I can turn it back on while watching a trailer or news. With the extension turned on my laptop lasts significantly longer. The data consumed by youtube has also decreased a lot.

What would have really helped was if it could cache / store most frequently watched youtube videos. That would have really reduced data consumption.

Very useful to people with data caps / FUP. Do hope it updated when youtube next changes their site. Keep up the good work.