"This visualization doesn't work right on Firefox+Linux, sorry! You could try Chrome/Chromium instead."
No Thanks.
No Thanks.
i.e. this particular dev probably tried it on Firefox/Linux, or got bug reports, and just decided to put up a disclaimer.
Right you are.
Do note that it works fine on my Ubuntu 18.04 machine with Intel graphics on the motherboard, in Firefox 68.
[1] https://www.theverge.com/2019/4/8/18300772/microsoft-google-...
Additionally, "websites" that are made for chrome drive even more people into this monoculture which is bad for the web.