I visited this page in Firefox and was presented with a message that essentialy said (paraphrasing): "this site best viewed with browser X". Now, I'm not a professional web developer, and maybe there are legitimate reasons why this app is depending on new cutting edge browser features that aren't yet supported by Firefox, but it seems to me that this just shouldn't be a thing anymore.

What feature was Firefox missing for it?

It requires a paid account though, doesn't it?

From this mondain to the maintainers, thanks!

What!? Amazing.

> sanctioned

Oh you mean it is or isn't approved.

come on man i got work to do