Sidebar first nav menu hide in firefox in example dashboard project.
Created by: qichunren
Firefox 55.0.2 (64-bit) https://getbootstrap.com/docs/4.0/examples/dashboard/
And in chrome it work right:
Created by: qichunren
Firefox 55.0.2 (64-bit) https://getbootstrap.com/docs/4.0/examples/dashboard/
And in chrome it work right: