Hi all well I have Win 7 64bit ultimate. Was watching videos on YouTube today using Firefox and everything was fine. Had tea and watch some shows on YouTube on the TV with my wife. After she went to bed jumped back on the computer and no sound at all on YouTube using Firefox. I have been to other sites and sound is fine. Sound works fine also with Chrome and other browsers just not Firefox I have been on google and tried a lot of things but still no sound in YouTube using Firefox Had a look in the registry deleted a file after watching vid on YouTube. opened services and restarted the sound. Any ideas?