When attempting to play youtube audio, firefox 80 on Mint 18.3 fails with these messages: [Child 11503, MediaDecoderStateMachine #1] WARNING: 7f167cbabcc0 OpenCubeb() failed to init cubeb: file /build/firefox-YY44jc/firefox-80.0+linuxmint1+sylvia/dom/media/AudioStream.cpp, line 330 [Child 11503, MediaDecoderStateMachine #1] WARNING: Decoder=7f16773f1000 [OnMediaSinkAudioError]: file /build/firefox-YY44jc/firefox-80.0+linuxmint1+sylvia/dom/media/MediaDecoderStateMachine.cpp, line 3891 [Child 11503, MediaDecoderStateMachine #1] WARNING: Decoder=7f16773f1000 Decode error: NS_ERROR_DOM_MEDIA_FATAL_ERR (0x806e0005) - RefPtr<MediaSourceTrackDemuxer::SamplesPromise> mozilla::MediaSourceTrackDemuxer::DoGetSamples(int32_t): manager is detached.: file /build/firefox-YY44jc/firefox-80.0+linuxmint1+sylvia/dom/media/MediaDecoderStateMachine.cpp, line 3470 [Child 11503, MediaDecoderStateMachine #1] WARNING: 7f1673a5f980 OpenCubeb() failed to init cubeb: file /build/firefox-YY44jc/firefox-80.0+linuxmint1+sylvia/dom/media/AudioStream.cpp, line 330 [Child 11503, MediaDecoderStateMachine #1] WARNING: Decoder=7f166ccc6400 [OnMediaSinkAudioError]: file /build/firefox-YY44jc/firefox-80.0+linuxmint1+sylvia/dom/media/MediaDecoderStateMachine.cpp, line 3891