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I have this problem in firefox with tampermonkey:

YouTube Player Perf will not work in this version of youtube. Disable it. Leave a kind comment on https://gf.qytechs.cn/en/scripts/471489-youtube-player-perf

what should i do? I try use tampermonkey in a private windows too but neither work

seem the author nopeless has already given up the update of this script.

The script is already broken as it does not have the automatic mechanism to deal with daily update of Youtube engine.