I know Brave is controversial but they were the only ones (edit: not sure about Vanadium, I’m curious if they were vulnerable) disallowing JS to access localhost thus blocking Meta and Yandex’s recently discovered spying.

Sounds like such a no brainer to not allow random websites to communicate with the localhost and very easily circumvent all sandboxing you spent thousands of hours building. Looking at you Android (Google) and all the browser vendors (also Google?, huh).

Yeah Jellyfin was forked from Emby’s last open release IIRC.