A note: Doesn't seem to work here, just a blank screen. Linux, Firefox 63.0b14, uBlock Origin. It does work in Chromium.
Firefox console says something about firebase being undefined: https://i.imgur.com/t4xOHGh.png
Firefox console says something about firebase being undefined: https://i.imgur.com/t4xOHGh.png
XML Parsing Error: undefined entity Location: chrome://browser/content/browser.xul Line Number 2483, Column 29: flex="1">&trackingProtection.on;</label> ----------------------------^