Both, I miss the first bit of audio, and when it plays it's not synced to video in video sources.
Its not just in Firefox, even the startup sound is being truncated.
Any music player as well, first bit of audio is gone and it plays approximately the same little bit of time after I stop playing.
I'll have to check, there is a pending kernel update I haven't done, zfs isn't ready for it apparently.
I don't think I've had another kernel update since I installed but I'll look when I'm home. Thank you!