Angular 6 [WDS] Disconnected Error on Firefox : <p>I use Angular and i get console error only on Firefox "<strong>[WDS] Disconnected!</strong>".</p>

<p><strong><a href="https://i.stack.imgur.com/TBvrX.png" rel="noreferrer"><img src="https://i.stack.imgur.com/TBvrX.png" alt="Firefox console error message is here"></a></strong></p>

<p>Here is my Angular-Cli version.</p>

<pre><code>Angular CLI: 6.0.1
Node: 8.11.1
OS: win32 x64
Angular: 6.0.1
... cli, common, compiler, compiler-cli, core, forms, http
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.6.1
@angular-devkit/build-angular     0.6.1
@angular-devkit/build-optimizer   0.6.1
@angular-devkit/core              0.6.1
@angular-devkit/schematics        0.6.1
@angular/animations               6.0.4
@ngtools/webpack                  6.0.1
@schematics/angular               0.6.1
@schematics/update                0.6.1
rxjs                              6.2.0
typescript                        2.7.2
webpack                           4.6.0
</code></pre>
