Buffers the video without autoplaying and puts it in HD if the option is on. For Firefox, Opera, & Chrome
< YouTube Auto Buffer & Auto HD 피드백으로 돌아가기
I am having the same problems in Chrome 39. Can change setting but doesn't seem to work on the page itself. I have had it working fine in Waterfox.
Script doesn't work in Chrome 38.0.2125.111 m
there is settings http://i67.fastpic.ru/big/2014/1105/e1/d3d3b6e6c3c72b49ce00511c7b6009e1.jpg
after open any video , it automatically starts playing ignoring settings (( http://i63.fastpic.ru/big/2014/1105/6a/cbe9ebb8e38cc40bd2e1e3e76079e56a.jpg