I use Ubuntu Mate 16.04.02 on a RPi 3. If I stream a video in firefox ( for example: http://www.sueddeutsche.de/panorama/baden-wuerttemberg-verdaechtiger-im-mordfall-maria-boegerl-bestreitet-die-tat-1.3453431 ) the audio output is just acoustic noise. It sounds like an old radio between two stations. The audio output of Youtube videos is just fine. I tried different browser (except chromium). With them it works all fine, but they all crash periodically. Is this a known issue or is there something wrong with my system? By the way: if I watch local videos with omxplay or vlc I here the correct audio.
I get the same result with Pi3Derek
Thanks for your answer.