Sure, browser is Firefox Desktop (whatever version is newest now), Chrome works fine, and as to the screenshot, here it is:
Damn, I've tried it out on Firefox on a Windows (10) machine and it works just fine. Not sure. Maybe a cache problem?
Can you try to run it with cache disabled (or incognito mode should also work just for testing it)?
If this is still a problem - maybe you'd be able to run it with dev-tools' console open and paste the errors that show up (if any)?