https://embed-snowflake.torproject.org/ seems not to work with firefox
Calling that URL or embedding it via
<iframe src="https://snowflake.torproject.org/embed.html" width="320" height="240" frameborder="0" scrolling="no"></iframe>
does not show the state being "enabled" - in opposite to the plugin which showed it (currently 12 users).
I do use here FF 128.11.0 at a hardened Gentoo Linux.