said by chachazz:That's what I did and it now works. Also I didn't know this issue existed in the beta and they still released it. What a joke.
All Beta releases of this Flash Player for Firefox (w/protected mode) have been crashing Firefox container.exe ...don't know why they released it with this problem.
Because there are several critical security fixes in this release, it may be better to just disable protected mode vs reverting to old version.