While YTFVP is catching up with the latest YouTube Flash blocking in Firefox, if what one wants is working video card hardware enhancements such as sharpening and dynamic contrast to work on YouTube as they were in Firefox, then:
I find that they work in Internet Explorer 11 in Win 7! It's playing in HTML 5, I think.
So, I don't know if they will work in Edge or whatever.
I'll be glad when YTFVP catches up again.
YouTube can be so amazingly blurry and flat all by itself. I hadn't seen it that way for awhile.
EDIT: IE is using mp4/AVC instead of the Google VP8 or 9 or whatever that is, that can't be sharpened in Win 7 browsers or by most video cards.