Thanks for the screenshot, but what are your settings in Google meet? see my screenshots

Recently (< 2 months) on Fedora 42, KDE Plasma, Firefox 144.0 (64-bit), in Google meet (2025 Nov 19th), the volume control for my microphone keeps moving towards zero over the course of 1-10 seconds, and I have to open the audio volume control panel and keep moving it back to 100% or whatever is most comfortable for the people I'm talking with. If I let go, it starts dropping again.

I've Googled this, and the advice I got was to disable Automatic Gain Control (AGC) in `about:config`. That didn't solve the problem.

I tried disabling these features next in `about:config`:

media.getusermedia.audio.processing.aec 0 media.getusermedia.audio.processing.aec.enabled false media.getusermedia.audio.processing.agc 0 media.getusermedia.audio.processing.agc.enabled false media.getusermedia.audio.processing.agc2.forced false media.getusermedia.audio.processing.hpf.enabled false media.getusermedia.audio.processing.noise 0 media.getusermedia.audio.processing.noise.enabled false media.getusermedia.audio.processing.transient.enabled false

Still the volume drops. When I switch to a MacOS 26.01 laptop, the volume doesn't drop.

Help?

If I was a conspiracy theorist, I'd say that Google's doing this on purpose so people will switch back to Chrome. :-)

Otherwise, I'd say that they didn't do sufficient testing of Meet with Firefox on Linux.

Edit: Update: I just tested on https://webcammictest.com/check-mic.html and it's doing the same thing, so I guess it's not Google's problem.

Just found out it also happens at https://webcammictest.com/check-mic.html , so I guess that makes it not Google's problem.