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Abobe Acrobat 10.0.1.434

Google Update 1.2.183.39

Java Deployment Toolkit 6.0.240.7

Java(TM) Platform SE 6 U24 6.0.240.7

Microsoft Office 2010 14.0.4730.1010

Microsoft Office 2010 14.0.4761.1000

Shockwave Flash 10.2.153.1

Silverlight Plug-In 4.0.60310.0

Windows Live Photo Gallery 15.4.3508.1109

Wolfram Mathematica 8.0.27.33471 (DISABLED)

mm... Should I disable all "Microsoft" related extensions to try? :)

That's probably a good idea. My guess is one of your extensions hasn't been properly updated for FF 4, but I'm not really sure.

Also use Plugin Check:

All my plugins are up to date.

The top 1 crash in Firefox crash stats...

If you believe that's it, do a thorough check of your system -- the associated bug report says it's due to malware interacting badly with Firefox.

Thanks for your help.

You give me a clue to deal with this problem!

And carefully checked all of my extensions. I found a Z extension hide itself in FF extensions list. Finally I deleted it.

I think this is a good way if FF can give users some clue to deal with crash problem. It might be a great help. Thank you.