Hello Everyone!!
So many people are having problems with Adobe's latest Flash Player that both Adobe and Firefox have created webpages solely for dealing with it. The easiest to navigate is from Firefox.
"Adobe Flash plugin has crashed - Prevent it from happening again": support.mozilla.org/en-US/kb/adobe-flash-plugin-has-crashed .
Important Steps To Note On This Page:
Update Flash:
Check Your Firefox Plugins: mozilla.org/en-US/plugincheck/
If it says that Flash needs to be updated, install the latest version manually using the steps below:
1. Download...etc.
Update Firefox...etc.

I haven't posted on here enough to post working URL's. Just paste these in search box.
After following these steps, Flashplayer is working well for me in Firefox.