alt Hacker Newsit does exist in `about:config`, which could be made as a UI setting instead:
`media.peerconnectin.enabled`.
on cromite[1], a hardened chromium fork, there is such a setting, both in the settings page, as well as when you click on the lock icon in the address bar.
[1]: https://cromite.org
IIRC the standard mobile firefox version no longer makes about:config available. You need to be on a beta or nightly build to access it.