This appears to have been reported upstream at https://bugzilla.mozilla.org/show_bug.cgi?id=1737212
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- Bug#998235: firefox: can not use microphone TANIGUCHI Takaki
- Bug#998235: firefox: can not use microphone Tiit Pikma
- Bug#998235: Can confirm with pipewire-pulse Bruno Kleinert
- Bug#998235: Firefox microphone (upstream bug report) Rupert Swarbrick
- Bug#998235: firefox: can not use microphone Tiit Pikma
