Please run firefox with G_DEBUG=fatal-criticals under gdb (firefox -g -d gdb) and attach the backtrace here, see:
https://fedoraproject.org/wiki/Debugging_guidelines_for_Mozilla_products#Application_crash

gtk_widget_get_window: assertion 'GTK_IS_WIDGET (widget)' failed"

usually means null pointer is passed to gtk_widget_get_window().

Martin, thanks for the info.

The "gtk_widget_get_window: assertion" looks harmless, there is no crash registered, but the message appears when I confirm/select the "microphone" permissions (I have no camera attached). I guess I'll buy a web camera and prepare a debug build before my next attempts :-) I'll keep you informed.

I have tried sharing a window from the ppc64le machine and it works = was seen correctly on the other machine in the Google Meet session (my x86 laptop).

In testing with a Bluejeans session, I see the same "gtk_widget_get_window: assertion" message when it should start to receive the video stream from the other host. So there is likely a relation between the message and displaying the video.

a progress report from last week - with locally built FF from trunk I can passively use Google Meet (can receive both audio and video), no change with Bluejeans. I'll keep you updated when there is something new.

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let's keep it open to track progress until things work out of the box

hi all -

Looks like this issue is five years old, but I'd like to propose that this is a newly relevant issue as IIUC it impacts default Fedora 41 / Firefox right now (at least it did for me):

https://www.phoronix.com/news/Fedora-41-Firefox-PipeWire-Cam

https://discussion.fedoraproject.org/t/firefox-doesnt-find-virtual-camera-in-fedora-41/135787

With update for Fedora 41, firefox out of the box no longer can locate the camera when you use google meet.    I had to change this obscure and not-explained-at-all-setting media.webrtc.camera.allow-pipewire to False and restart.  then it was back.

Thing is, I can find nothing else about this setting or pipewire or anything else so it seems like there should at least be a fedora BZ.

I can open a new BZ if this is not the match it looks like.

perhaps https://jgrulich.cz/2024/12/13/when-your-webcam-doesnt-work-solving-firefox-and-pipewire-issues/ helps

I guess we should close this bug as it's from the pre-pipewire times and was rather specific to ppc64le.

I have a Logitech Webcam C930e and have tried it in firefox-138.0.1-1.fc41.x86_64 with WebEx, Zoom, Google Meet. The camera are available in all systems. media.webrtc.camera.allow-pipewire is True.

funny I have a logitech C922 webcam and that is exactly the camera that firefox can't see (but it also can't see my laptop camera).

The article in https://jgrulich.cz/2024/12/13/when-your-webcam-doesnt-work-solving-firefox-and-pipewire-issues/ certainly gives me a lot more background on where to look though, so I'll see if I can get pipewire working through those means.   The mentioned v4l2 plugin issue seems like a likely candidate, so I will continue from there, thanks

The original report is not relevant any more (5 years old). For issues with recent Firefox please open new bugs.