Adobe announced on its blog that a public beta version of the sandboxed Flash Player for Firefox is now available for download at this page. Unlike the sandboxed Flash Player for Chrome that was launched in 2010, the Firefox edition will not be integrated into the browser, it's still a plug-in.
Today, Adobe has launched a public beta of our new Flash Player sandbox (aka “Protected Mode”) for the Firefox browser. The design of this sandbox is similar to what Adobe delivered with Adobe Reader X Protected Mode and follows the same Practical Windows Sandboxing approach. Like the Adobe Reader X sandbox, 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 for Firefox 4.0 or later will be supported on both Windows Vista and Windows 7. We would like to thank the Mozilla team for assisting us with some of the more challenging browser integration bugs. For Flash Player, this is the next evolutionary step in protecting our customers.