它禁用自动播放，并启用点击播放。
< 脚本 YouTube Click To Play 的反馈
Yes, it does works on Firefox.
So this script is mainly for Chrome users, but it could also help other browser users with its autoplay switch feature and so on.
(Actually, my main browser is Firefox, but I use Chrome for some sites including YouTube)
I guess it may be useful for users who only want autoplay disabled specifically for YouTube
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(Firefox) about:config -- > media.autoplay.default --> 0