Steam Virtual Menus not showing up for Firefox added as Non-Steam game

This is an automated archive made by the Lemmit Bot.

The original was posted on /r/linux_gaming by /u/Invis4ever on 2023-06-27 19:00:13+00:00.

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Here's what I did

• Steam runs in BPM on a Kubuntu PC.
• I added Firefox to my steam library as a non-steam game and edited the shortcut so that it automatically opens netflix in --kiosk mode.
• I set up a custom controller layout so i can use netflix with my controller

Works: I can use the layout to steer the mouse and click using the controller.

Here's what I am trying to do

I want to also make a keyboard out of my controller. I think that radial menus will make a reasonable input method.

The Problem

Virtual menus do not show up. At all.

What I checked: Enable Steam Overlay in Settings

Any Ideas, what to look into?