Greasy Fork is available in English.
改进 YouTube 剧场模式，参考 Twitch.tv 的设计，增强视频与聊天室布局，同时保持性能与兼容性，也达到了类似B站的网页全屏功能。同时新增可选的、自制风格的浮动聊天室功能（仅限全fullscreen模式），融入了 YouTube 原有的设计语言。
Noted, I'll try to look into this.
Alright it turns out that it's VERY hard for me to look into this issue without a physical Apple machine to debug on. I will give up and consider this script as incompatible with Apple systems and provide no explicit support. Feel free to fix it yourself if you are willing.
Okay, I think I have an idea what the problem is, but the fix will take while.
Not working with Safari on macOS playing recorded streams (chat replay).