Greasy Fork

Works. Is compatible with [Youtube live, Simple Chat Stylizer], though you may have to toggle theater off and on.

Thanks for the review, can you explain to me about the "toggle theater off and on" thing? Thanks.

Sure. One time that I loaded a video page, it loaded in standard theater mode, not fullpage theater. Disabling and enabling theater mode resulted in fullpage theater mode.

I haven't had the script installed for long, so I don't know how common it is yet, but it has only happened once, so for now, it seems to be rare. I have a handful of scripts affecting YouTube, so it could be an interaction with those other scripts.

I can't reproduce it at will, and the workaround was trivial; therefore, this is neither a complaint nor a bug report. It's merely some advice in case other people encounter the same thing.

I've added a fix to address that problem (hopefully), but if it happens again, feel free to report the problem here.