Flash sometimes freezes firefox, also many npviewer.bin processes left running around

[Yuri]

Sometimes after some flash object is displayed firefox gets frozen for 
many few seconds,maybe ~20sec.
Do you see the same? Is there anyfix for this?

In additions I have 54 processes like this one
50006  ??  I      0:00.00 
/usr/local/lib/nspluginwrapper/i386/linux/npviewer.bin --plugin 
/usr/local/lib/linux-mozilla/plugins/libflashplayer.so --connection
hanging around even after firefox process exits.

linux-f10-flashplugin-10.0r45
nspluginwrapper-1.2.2_5
firefox-3.5.8,1

Yuri