After upgrading to Firefox 4.0, Flash pages including youtube started freezing.

Hi, just like everyone else, today I upgraded to Firefox 4.0 from 3.6.
I had many addons like:
# addblock
# zonealarm (disabled)
# free download manager plugin (disabled)
# java
# Shockwave Flash
Although everything was working fine with 3.6 (I had check it throughly), now with 4.0 The flash games and flv (flash videos) sites like youtube, dailymotion are freezing while playing.

I've just tried to play the video @ http://www3.nhk.or.jp/daily/english/17_34.html but get the same problem.
Hang on until one of the Mods come along, I'm sure one of them will know the answer.

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