Crashes or other problems with certain multimedia content in Firefox (such as Youtube videos and Flash animations or games) can often be resolved by performing the steps in these Knowledge Base articles:

• Flash Plugin - Keep it up to date and troubleshoot problems

• Adobe Flash plugin has crashed - Prevent it from happening again

• Flash 11.3 doesn't load video in Firefox

On Windows Vista and above, you can disable Flash protected mode by following the instructions on these pages:

• http://forums.adobe.com/thread/1018071#TemporaryWorkaround
• http://kb.mozillazine.org/Flash#Disabling_Protected_Mode_in_Flash_11.3

(See this Adobe blog post for technical details about Flash protected mode.)

Please tell us if this helped!

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

• Do NOT click the Reset button on the Safe Mode start window.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Hi,

None of the above worked though I did them.

I switched to an earlier version of Flash and performed the following, which worked:

Add 4 extra items to about:config.

Right click in the white area and in the little box go to New---> then click on Boolean to do each of these below.

dom.ipc.plugins.enabled.npctrl.dll
dom.ipc.plugins.enabled.npqtplugin.dll
dom.ipc.plugins.enabled.npswf32.dll
dom.ipc.plugins.enabled.nptest.dll

You can copy and past in each one instead of typing them.Make sure they are all False there is one more that all so need's to be false.

dom.ipc.plugins.enabled <----This all so need's to be false.It should all ready be in there so double click on it.Add them first then below is another option needed.

Click on Start>Control Panel>System Properties>Advanced>Environment Variables>System Variables> / New

Then add these.you can copy and past them Variable Name: MOZ_DISABLE_OOP_PLUGINS Variable Value: 1 (These steps are from another site.)

It shouldn't be necessary to disable the plugin-container process this way.
This will cause Firefox to crash or hang if there is a problem with a plugin.

Did you make sure that security software isn't causing issues with the plugin-container process?

• http://kb.mozillazine.org/Plugin-container_and_out-of-process_plugins

No, I didn't try that because my afore-mentioned steps solved my problem. I haven't had crashes.