Adobe has released recent updates to better protect Flash along with beneficial improvements for the Firefox 13 browser

https://isc.sans.edu/diary.html?storyid=13417
http://www.adobe.com/support/security/bulletins/apsb12-14.html
http://blogs.adobe.com/asset/2012/06/inside-flash-player-protected-mode-for-firefox.html

QUOTE: New Flash updates have been released today.  In addition to this there have been some good changes for flash on Firefox with the addition of the sandbox.  More info on the sandbox and a good explanation can be found in the blog entry above.