Adobe has released a public beta version of its Flash Player software for Firefox that forces the program to run in a heightened security mode. Sandboxing is an established security mechanism that runs the targeted application in a confined environment that blocks specific actions by that app. The same technology has been built into the latest versions of Adobe Reader X and Google Chrome, but this is the first time sandboxing has been offered in a public version of Flash for Firefox. Flash Player 11.2 beta 5 works with Firefox 4 or later running on Window Vista or Windows 7.”]
Source: https://krebsonsecurity.com/2012/02/forcing-flash-to-play-in-the-sandbox/