I did some research on Flash crashing in Firefox and found ways to stop the process of it crashing. I was tired of Zynga games on Facebook causing flash and then my browser right after to crash. I would have this happen just seconds or minutes after starting EACH game I played so here is what I found....
Do NOT do these steps unless you fully understand how to do them after reading. You are getting into your computers system settings and you want to make sure you are changing the FLASH settings ONLY because when you
are doing Step 2, there are other settings you could change that may not be good and have unwanted results.
I hold NO RESPONSIBILITY for any settings other than flash that you change that cause unwanted results so do these steps at YOUR OWN RISK ....
It helped for me though. Doing just step 1 may not stop it from crashing. It didnt help for me until I did BOTH steps.
Step 1)
If you have the most up to date Firefox and Flash just skip to the part that says (Disable hang protection)
https://support.mozilla.com/en-US/kb/The%20Adobe%20Flash%20plugin%20has%20crashed
Step 2)
In some cases you may want to disable the "out-of-process plugins" (OOPP) crash protection feature; e.g., to troubleshoot problems that first appeared in Firefox 3.6.4 or above. To disable crash protection, go to about:config and set all dom.ipc.plugins.enabled.* preferences to false. This will prevent the
"plugin-container" process from running and all plugins will run within the Firefox browser process.
Basically what the above is saying is just type in about:config in the address bar where you type in stuff like www.facebook.com and then in the FILTER search bar type dom.ipc.plugins.enabled Then double-click each
preference to change the value from "true" to false, as shown below on Windows.
For a screen shot on how it should look go here:
http://kb.mozillazine.org/Plugin-container_and_out-of-process_plugins#Disabling_crash_protection
Again, do these steps at YOUR OWN RISK, and I am just passing along info that helped me, not forcing anyone to do this.