Today, Flash Player 11.3.300.268 for Windows and Macintosh was released to address stability issues when browsing and playing Flash content.
For full details on the 11.3 release, please see our release notes.
If you continue to have problems, please see these tech notes for suggestions and instructions for reporting issues to us:
For Firefox users crashing with today's update who are willing to assist us in determining the cause of the crashes, it'll be helpful if you can download and install the Firefox 15 beta release and submit all crash reports when they occur. Crash logs created and submitted with Firefox 15 will allow us to gather critical details that are missing from the current crash reports that are being generated with Firefox 13 and 14 and earlier versions.
Users encountering crashes with the FlashPlayerUpdateService.exe, please see this post for additional details and current workarounds.