Both OBS and Firefox do not use Pipewire input by default
- Firefox: go to about:config and search for “pipewire”
- OBS: GitHub - dimtpap/obs-pipewire-audio-capture: 🔊 Audio device and application capture for OBS Studio using PipeWire
Note that for OBS Flatpak you need to use the Flatpak variant of the plugin and follow this howto:
Then if they use, you can try if they see the camera