Firefox goes into Infinite Loop when File Upload Dialog Open

I noticed from this week,

Firefox take 90%> is CPU usage when I open File Open Dialog for uploading.

I guess this may b Infinite Loop, just like Local DOS Attack.

and when I google search many people shouting for similar things.

http://www.google.co.jp/search?q=firefox+freeze+when+upload&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a