site, firefox. menu button didn't work

[qwabra]

https://material.preactjs.com/

• windows
• firefox
• 72.0.2 (64)

menu button didn't work. chrome is ok.

[renanlecaro]

I made a video demonstrating the problem : https://www.youtube.com/watch?v=r3WQAtt41z0

It's broken on the latest firefox on unbuntu and windows