Do you mean the .deb file from thatguruguy, posted on Fri Oct 28, 2016 1:37 pm?
There is still a problem with the HW acceleration of videos but the Rasp. Pi Org says that YouTube shell run smoothly on the Pi 3.
Btw. Pixel comes with Chromium V. 51.0.2704.91, if anyone would like to know.