I was kinda bummed that Jelly Bean doesn't have flash so I did a little research and found a way, no root needed. Just follow the easy instructions and there ya go. I did the download and it installed with no problems at all. Make sure you have "unkown sources' checked in the security settings. I did a complete scan of the apk file and it is clean. Enjoy! One last thing, this only works on the stock browser.
Also, skip step 2. You don't have to transfer the apk file to your internal SD card on your phone.
Here's the link:
http://www.androidrootz.com/2012/08/how-to-install-adobe-flash-player-on.html