I have been having problems with this for about the past 2 weeks. I have Windows Vista and Firefox 15.0 installed on my computer. Ever since the new version of Flash Player came out I've been getting messages that Flash Player has stopped working and that Data Execution Protection has closed it to prevent damage to my computer. This happens constantly when I visit a website with images that need Flash Player to work, when I'm trying to access my voicemail from my ISP online, and trying to watch vidieos that require Flash Player. Is there any way to resolve this? I've tried uninstalling and reinstalling, but it doesn't do any good. I've also tried installing an earlier version, but this doesn't work either...I keep receiving the same messages.
Your issue sound same with this post in FireFox forum:
What is your HW manufacture and model? can you try older version of Flash Player and see if the problem still show?
It might be cause from FP 11.3 if it's related with protected mode.
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