i habe a problem with virtualizing Firefox 15.0.1 with a working Adobde Flash Player.

I tried 2 solutions:

1. Virtualizing Firefox with native Installed Flash Player on lokal machine:
When I open a page like Youtube.com, Firefox crashes with a Sandbox Error.

2. Virtualizing Firefox with Flash Player as a Component:
When I open a Youtube page Firefox freezes without an Error.

Is there a working way to get a virtualized Firefox with wokrking Flash Player?