By the way, I strongly recommend getting the updated x64 bit flash instead. Instructions for that given here.
Update: there is an even newer version available here.
sudo gedit /usr/lib/nspluginwrapper/i386/linux/npviewer
Add this before the last line of text “export GDK_NATIVE_WINDOWS=1”, then save and restart firefox.
Note this is only for x64 machines/installs.