Mozilla firefox and Edge mat-menu scroll strategy not working

[ghost]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

MatMenu scroll strategy should work properly in Mozilla Firefox, Edge
Go, https://material.angular.io/components/menu/overview
Open a menu and scroll

What is the current behavior?

Mozilla Firefox, Edge MatMenu Scroll Strategy Not Working

What are the steps to reproduce?

What is the use-case or motivation for changing an existing behavior?

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular 6.0.2 - material.angular.io version
Browsers: Mozilla Firefox, Edge

Is there anything else we should know?

[crisbeto]

Closing as a duplicate of #11365.

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