Flash Player will establish a low integrity, highly restricted process that must communicate through a broker to limit its privileged activities. The sandboxed process is restricted with the same job limits and privilege restrictions as the Adobe Reader Protected Mode implementation.
Adobe Flash Player Protected Mode will require Firefox 4.0 or later and Windows Vista or Windows 7.
Sandboxing technology has proven very effective in protecting users by increasing the cost and complexity of authoring effective exploits. For example, since its launch in November 2010, we have not seen a single successful exploit in the wild against Adobe Reader X.
The final version will be shipping later this year. You can download the beta and read more about the preview release from Adobe Labs.