Update: Even newer flash player available here.
So I decided to give the true 64 bit flash a go. I ran over to adobe, and grabbed this file, then it’s just untar and drop libflashplayer.so in /usr/lib/mozilla/plugins/ . That’s the install, make sure you get rid of any previous versions of flash before doing this. No more npviewer to lock up either. Though it looks like the cpu load of firefox has increased somewhat to make up for the lacking npviewer, but it seems firefox is still less resource intensive than old firefox + npviewer.