In my old computer, when I open youtube video firefox can buffer the video, so that when I go offline it still can play the video from cache. But now, in my new computer (I use Firefox 3.6 for start up) when I open video in youtube it can't buffer. when I go offline it can't play it again. When I checked in cache, it turn out firefox still save the video there. What is wrong with my firefox? I already try to match the setting and extension and plugin with the old one, but still not change anything. Please help... Thank you.