flash9 hangs firefox a lot

[Wojciech Puchar]

>   just recently upgrade flash 7 to flash 9 following the
> instructions. but lately found out that firefox hangs a lot when
> visiting pages running flash. and the console reports:
>
> *** NSPlugin Wrapper *** ERROR: NPP_Destroy() wait for reply: Message timeout
> *** NSPlugin Wrapper *** ERROR: NPObject 0x32435650 is no longer valid!
>
>
> how can I get rid of that?? thank you!!
>
ask adobe - they wrote flash