Menu: click on disabled button does not close the menu in Firefox

[PierreRott]

Reproduction

https://stackblitz.com/angular/yvgvkgpqmpy?file=app%2Fmenu-icons-example.ts

Steps to reproduce:

1. open menu
2. click on disabled button
3. check whether the menu is closed or not

Expected Behavior

Menu should close.

Actual Behavior

Menu does not close.

Environment

Angular CLI: 8.0.3
Node: 10.16.0
OS: win32 x64
Angular: 8.0.2
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router

Package Version

@angular-devkit/architect 0.800.3
@angular-devkit/build-angular 0.800.3
@angular-devkit/build-ng-packagr 0.800.3
@angular-devkit/build-optimizer 0.800.3
@angular-devkit/build-webpack 0.800.3
@angular-devkit/core 8.0.3
@angular-devkit/schematics 8.0.3
@angular/cdk 8.0.1
@angular/cli 8.0.3
@angular/flex-layout 8.0.0-beta.26
@angular/material 8.0.1
@ngtools/json-schema 1.1.0
@ngtools/webpack 8.0.3
@schematics/angular 8.0.3
@schematics/update 0.800.3
ng-packagr 5.2.0
rxjs 6.5.2
typescript 3.4.5
webpack 4.30.0

• Browser(s): Firefox 68.0.1
• Operating System (e.g. Windows, macOS, Ubuntu): Windows 10 Enterprise

[crisbeto]

Will be fixed by #16696.

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