Hi. I am using FF33.0 and if I watch Silverlight videos I can't minimize or change the tab without getting sound problems. It sounds like video would slow down and thus distorting the sound. The sound stops distorting after 30sec-5min after the tab is changed or window minimized. If I change it back to the tab where Silverlight video is playing and the sound is distorting it stops immediately. I have tried to reset FF and uninstall and re-install. The problem is limited to FF only. Chrome and IE work fine. Thank you for any help!