You Tube not playing video on Firefox with Adobe Flash after latest update

You Tube and other sites are not playing video on Firefox with Adobe Flash after latest update for both. Adobe Flash is working on other sites but not You tube and those sites that may have embedded You Tube videos, I'm not sure.
Adobe Flash does not crash and no error message is showing. All that shows is a dark screen for the Flash video. Right clicking the screen shows only a non-clickable 'Movie not loaded' and the clickable link to the Adobe home page.
I have spent an hour trying things as suggested for past problems similar to this but none have helped.
I have sent sad face letting you know what I think of the latest update because of this which says pretty much the same thing as I have said here.
I have no further info but if I had some input and queries form you I might be able to provide more.

I'm not sure how to remove the 12.xxx version,. I don't understand why it is there, usually updates over wirte the old one as far as I know. I don't know where to find it.
pref .js deleted.
I could not find a user.js
I disabled hardware acceleration on one of them, not sure which and I don't remember how I did it but think it must have been on the flash.
No idea what protected mode is
no new profile, I've never done this.
Ok, did what you have said as much as I could. I have been fidgeting with things now for a couple hours. After doing a CCleaner and Registry cleanse, turning off and restarting the computer, the videos are now p-laying.
I would still like to know how to find and get rid of the duplicate Flash plug in though if you would't mind.
Thanks for the help.

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Use the search feature and type in Flash and there are like thousands of posts on this.
You seem to think you are addressing Apple with your post. This is a user forum and we are all users just like you.

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I asked this question again and i reported this bug , i am a computer engineer and i tested it with few macbook pro retina laptops , when u use win 8.1 64 bit or 32 bit and install adobe flash under firefox try to play any game in facebook , view video on youtube or use any FLASH video and move the mouse above the screen of the flash game / video / etc , the screen will lag alot .
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I
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[[Image:aboutcrashesFx29|width=520]]
<br><br>
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More information and further troubleshooting steps can be found in the [[Firefox crashes - Troubleshoot, prevent and get help fixing crashes]] article.

You Tube not playing video on Firefox with Adobe Flash after latest update

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