I was always searching and googling everywhere for a method to do so.
I ended up with another extension called
Youtube Video Quality Manager but it never worked. It downloads and installs, but nothing actually installs.
I also ended up adding scripts, which worked. I have customizable settings in every YouTube video that i watch.
But only thing that works is the video panel size. Normal,strech or full screen. Video quality i always have to change it manually.
I will give this a try.