firefox gets hang with Vista or Windows 7 x64 - do you face this issue too?

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I am facing firefox hanging issue from very long.. I am using windows Vista x64 and Windows 7 x64 in another machine.. firefox gets hanged after some hours.. and I need to restart only otherwise it won't release memory. Have you face this problem too?? I am using firefox 5.. in previous version I was having same problem too..