In Firefox you don't have to do the insert+z. For me I have to down arrow to where it starts to read "Flash Start". then the buttons appear like default, normal and some others. I managed to find this slider/progress bar? between watch later and pause buttons. When on this object with % announcements I pressed my up arrow key to increase the volume sound. Hope this helps the Firefox users with the youtube.com audio being silent. To unsubscribe from this list, send a blank email to: pc-audio-unsubscr...@pc-audio.org