There was an update to flash in google play. So i gave it a try. I can now watch my Amazon prime videos using stock browser! Not sure how long this will last...
you can google "adobe flash archived files" and direct download from adobe for jelly bean. When you open the page you just scroll down to the android 4.0 version and it works fine.
I have a GN2 and loaded it a week ago and it works fine.