User Agent: Mozilla/5.0 (X11; SunOS i86pc; rv:22.0) Gecko/20100101 Firefox/22.0 (Beta/Release) Build ID: 20130524143229 Steps to reproduce: The Firefox 22.0b1 and b2 OpenSolaris i386 builds do not play audio on YouTube html5 videos. Flash is disabled. Many YouTube videos will play in html5 if Flash is disabled. I tried enabling Flash and viewing the same video. The Flash plugin crashes repeatedly, so don't know if sound plays with Flash. I checked with 21.0b7 and sound does play. Actual results: The video plays but there is no audio. Expected results: The audio should be heard.

Do you have sound with this video e.g.? http://clips.vorwaerts-gmbh.de/big_buck_bunny.webm If it's possible on Solaris, could you run the tool mozregression to find a regression range (see http://harthur.github.io/mozregression/ for details). Firefox 22 nightlies started in Feb 2013 (--good=2013-02-01).

The old sound library (libsydneyaudio) was removed in Firefox 22. Nobody has contributed a Solaris backend for the new sound library (libcubeb) yet.

There is no sound with the clip you linked to with the Firefox 22 branch and there is with 21. The removal of a sound library would explain why this is happening. The Firefox, Thunderbird and Lightning builds are contributed by the Oracle Solaris Desktop Beijing Team. Ginn Chen has responded to other Firefox bugs. I would suggest to contact him.

FWIW: On Solaris 11 or above, compile Firefox with --enable-pulseaudio will have sound.

I'm using OpenIndiana. PulseAudio is not in the repos. According to Alan Coopersmith's blog, library/audio/pulseaudio 1.1 was added to Solaris 11.1. about:buildconfig does not show --enable-pulseaudio Configure arguments --enable-application=browser --prefix=/usr --libdir=/usr/lib --mandir=/usr/share/man --enable-official-branding --enable-updater --enable-debug-symbols=no --enable-update-packaging --enable-update-channel=beta --disable-tests --enable-jemalloc --enable-dtrace --enable-xinerama --disable-crashreporter --enable-ipc

This bug can be marked solved and closed. I've used 23.0b5, 23.0.1, 24.0b9 and 24.0b10. All have sound with html5 videos. Thank you.