[dev-v5] FluentSelect is broken in Firefox

[MarvinKlein1508]

🐛 Bug Report

The option menus aren't working correctly within Firefox.

💻 Repro or Code Sample

https://fluentui-blazor-v5.azurewebsites.net/List/Select

🤔 Expected Behavior

I expect the menus to open just like in Edge or Chrome.

😯 Current Behavior

Please take a look on this short video: https://www.youtube.com/watch?v=Rsw_2mfEilU

🌍 Your Environment

It works just fine in both Edge and Chrome but not in Firefox.

[dvoituron]

Weird. This seems to be caused by the overflow-y: auto; of <div class="fluent-layout-item" area="content">

Need investigations

[dvoituron]

This is a WebComponent issue. I've reported this bug in the associated repo. No further action on our side.
microsoft/fluentui#34224