This corruption appeared in Firefox about 7 days ago and coincides apparently with some changes made to the Youtube player interface. Video and counter will freeze wile audio will often times play on, but not always until the end and the entire player will then freeze and crash. The Player controls in Youtube have been obviously re-done. The Solutions posted are a joke and are written for laypersons. They don't help or solve anything. The last time this problem appeared I was able to solve it by rolling back to an older version of Firefox with a complete clean re-install. The refresh option does not work in this case, so I have to doubt that a full reinstall will help, but this will be tried next. Its really shameful that all the software application keep devolving so horribly and almost zero works as well as it once did.