>> I have no idea what sandbox settings you're referring to. >> How/where can I find those to "tinker" with? > [1a] also: about:config -> security.sandbox.*
Hmm... I set both `security.sandbox.socket.process.level` and `security.sandbox.content.level` to 0 as well as `media.cubeb.sandbox` to false (and restarted Firefox) but it didn't help. My current test is to open firefox file:///my/music/storage/ and click on an Ogg file. [Child 17314, MediaDecoderStateMachine #1] WARNING: 7f92bdd47ee0 OpenCubeb() failed to init cubeb: file ./dom/media/AudioStream.cpp:281 [Child 17314, MediaDecoderStateMachine #1] WARNING: Decoder=7f92beb9cf00 [OnMediaSinkAudioError]: file ./dom/media/MediaDecoderStateMachine.cpp:4604 [Child 17314, MediaDecoderStateMachine #1] WARNING: Decoder=7f92beb9cf00 Decode error: NS_ERROR_DOM_MEDIA_MEDIASINK_ERR (0x806e000b) - OnMediaSinkAudioError: file ./dom/media/MediaDecoderStateMachineBase.cpp:164 - Stefan