I'm playing on desktop. I tried to play in Firefox's private mode, but the emulator didn't load. I don't know if this is intended or a bug, but just thought I'd let you know.
Ah it looks like Firefox in private mode doesn't support indexed db with is used for storing the games locally and for auth. I should add some error message for that case :) Thank you for reporting. https://bugzilla.mozilla.org/show_bug.cgi?id=1639542