Excellent app, recommend to All!

So far, it seems to be a brilliant extension, but I will have to figure out all its possibilities.
For example, I think I installed the ffmpeg correctly, but when I try to merge, my Firewall asks for permission to connect to 127.0.0.1 etc.
I'm guessing that this is not a problem, but I will have to figure that out before I allow it.
It would be nice if that was explained somewhere.
PS: I gave the permission to my firewall, because the adress 127.0.0.1 directs to my own computer ("localhost") and in the "settings" of the extension I Installed the "native client" and the "Ffmpeg". The merging didn't work at first, but then I specified the path where the "Ffmpeg" is located, and the path where I wanted the merged file to be created, and it worked!
BRILLIANT!!!
PPS: The problem with this extension is that the developer did a poor job of explaining how it works and how to set it up correctly. For example a very basic thing was never explained: when one downloads a "video only" resolution, an audio file will be downloaded too, and if the extension is set up correctly, the two will be merged.
Fascinating how some people don't understand the need for good communication...
Take a look at this video which explains just that:
https://www.youtube.com/watch?v=xGqn2RRbcjw
And I still don't know what "Post processing (if FFmpeg is installed)" is about?

My experience is the same as a reviewer below; the files aren't automatically merged, even if I point it to ffmpeg. But this is actually a plus! The DASH_A and DASH_V files are saved separately in my default download directory. So, if I want just audio or video, no need to do anything. And, the ffmpeg command to merge them is straightforward, and because it is a copy, fast and no loss of quality because of demuxing and muxing. e.g. ffmpeg -i file_DASH_A.mp4 -i file_DASH_V.mp4 -c:a copy -c:v copy file.mp4
Perfect!

Want to download 1080p and higher resolution videos? This is the only plugin does this with transparency.

Works like a charm!

it worked like a charm for me. Thanks

Tut genau was es soll. Die unterschiedlichen Download-Methoden funktionieren. Bislang hatte ich keine schlechten Erfahrungen.
Wenn YD auch auf anderen Plattformen arbeiten würde währe es perfekt ;-)

Wow, I'm so impressed I've actually registered to write this comment !

So I have been testing many ways to download the best audio quality from YT video. I've tried several online downloaders and apps and compared the output audio quality they offer.
But why there is such variety of audio formats and bitrates in audio files between many applications downloading from the same YT video ?
Because they all convert YT audio into another lossy format !

And then I found this extension ! When you download "audio only mp4" it doesn't convert anything, it lets you download audio file directly from google/YT servers and it's identical to origal audio you can hear while watching HD movie on YT (I've checked!) ! :)

So it's amazing extendion!
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My only suggestion would be to change extension of downloaded "audio only mp4" file to m4a or mp4a ,so it wouldn't look like real video file.