audio fix for firefox

MediaBrowser.WebDashboard/Api/DashboardService.cs

@@ -522,6 +522,7 @@ namespace MediaBrowser.WebDashboard.Api
 
             await AppendResource(memoryStream, "thirdparty/video-js-3.2.0/video.min.js", newLineBytes).ConfigureAwait(false);
             await AppendResource(memoryStream, "thirdparty/autoNumeric.js", newLineBytes).ConfigureAwait(false);
+            await AppendResource(memoryStream, "thirdparty/html5slider.js", newLineBytes).ConfigureAwait(false);
 
             await AppendResource(assembly, memoryStream, "MediaBrowser.WebDashboard.ApiClient.js", newLineBytes).ConfigureAwait(false);
 

MediaBrowser.WebDashboard/MediaBrowser.WebDashboard.csproj

@@ -437,6 +437,9 @@
     <Content Include="dashboard-ui\thirdparty\autoNumeric.js">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>
+    <Content Include="dashboard-ui\thirdparty\html5slider.js">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
     <Content Include="dashboard-ui\thirdparty\video-js-3.2.0\demo.html">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </Content>