On FF 13, since updating Adobe Flash, starting an embedded youtube video locks scrolling with the trackpad AND disables hardware volume control buttons
this happens on popular sites, so it's not an isolated problem for me. I just updated flash to 11.3 and I am having this issue, along with a now invisible progression bar in youtube videos, until I mouse over it, which somehow makes it appear again.
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This may be caused by a recent Flash 11.3 update.
See: