Works fine in firefox for me.
When this happens and people switch to Chrome, there's less money/resources for Firefox to continue on and we just keep pushing farther toward a world where developers only need to focus on Chrome. It's a cycle that ends with Google controlling all access to the internet.
Works great in Firefox for me.
Works on Chrome first time.
I checked the console for errors. There were two warning about deprecated API usage and nothing else.
I hate "It works for me" as the end of troubleshooting.
But whether you can replicate the issue on other systems is valid diagnostic information.
It could legitimately still be a firefox bug, one that relates to your system in particular. But I have no way to tell from over here.