Buffers the video without autoplaying and puts it in HD if the option is on. For Firefox, Opera, & Chrome
< YouTube Auto Buffer & Auto HDについてのフィードバック
No clue/to lazy to search longer for edit option. I searched for some addon doing the same things this script does, and after installing one with best marks, it asked me to opt-out of some youtube beta something. After doing as it asked - clicking restore old youtube, script got back to working fine.
yeah the problem is with the new youtube interface as the script hasn't been updated(and probably won't) look on google on how to go back to old style
Script fucks up Youtube since 30-08-2017
Script semi works, as in stops videos and switches to hi-res, but only things that load on the page are top bar with menu button on the left (3 bars one) and search box with button but no icons. Video also loads and is like I said stopped/changed quality. But there is nothing else, no comment, no info about video, no other videos on the right, like nothing loads.
Only solution to repair is to switch the script off.