Adobe Flash Player 12.0.0.77 not playing in Mozilla Firefox 27.0.1

I am using Windows XP. I downloaded Adobe Flash Player 12.0.0.7 and installed it on my computer. I opened Mozilla Firefox 27.0.1 and went to youtube to watch videos. I clicked on a video to watch and received the following information:
The Adobe Flash Player is required for video playback.
Get the latest Flash Player.
I opened Control Panel on my computer and saw that Adobe Flash Player is indeed installed. So why is Firefox not recognizing it?

I opened Firefox, clicked on "Tools", clicked "Add-ons", and noticed there is a "Shockwave Flash 12.0.0.77" listed. Is that the adobe flash player?
Yes, it is.
It is set on "never activate" - because when I have it on, I get a computer page stall from time to time, and a little window pops up saying, "Warning: Unresponsive script, A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete."
See: https://support.mozilla.org/en-US/kb/warning-unresponsive-script for a few suggested solutions.
BTW, "script" errors are not the same as Unresponsive plug-in errors.
The former are caused by javascript, ASP script or PHP scripts (in the page code) malfunctioning or "locking up".
The latter are caused by a defective plug-in (like Flash Player).

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On Mon, Oct 27, 2014 at 8:59 PM, Apple Support Communities Updates <

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Adobe Flash Player 12.0.0.77 not playing in Mozilla Firefox 27.0.1

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