Luckily, the developer community likes to try things on their own and see what happens. XDA member stempox went a head and snagged the Flash APK and side loaded it to Jelly Bean and found out that it works just fine. This can be particularly helpful on the Galaxy Nexus or Nexus S running Jelly Bean, as well as any JB ROM you might be running currently. This is really the only option since Adobe blocks the app in the Play Store when it knows you are on JB.
Lets not stop there though. What about the Nexus 7? Well, the N7 doesn’t have the standard browser that Google has been using in the past. Instead the device is pre-loaded with the Chrome Browser. Since the Chrome for Android browser won’t support plug-ins, installing the Flash APK won’t do you any good. You would need to copy over the Browser.apk to /system/app using a file manager that lets you cruise through root files. Not all that difficult, but still a hassle.
Either way, Flash does still work, just don’t expect Adobe to ever release an update to solve any issues you might experience. If you want to look into both options, head to stempox’s xda thread for Flash and Censura_Umbra’s xda thread for the Nexus 7