youtube doesn't work in Firefox 25

Video works in Firefox 25 as long as it isn't youtube or youtube based.

I tried using youtube in Firefox safe mode with all add ons and plugins disabled and it still doesn't work.

I installed the latest flash player and it didn't help. I also disabled hardware acceleration and that didn't help.

On my machine, I get an error has occured immediately when attempting to bring up a video.

On another machine in the network, it starts as if it is going to work and it doesn't move.
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dovidfCEOAsked:
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dovidfConnect With a Mentor CEOAuthor Commented:
I left shockwave enabled and the Greasemonky and Youtube html5 kiss to force html5 work.
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helpfinderIT ConsultantCommented:
Did you try on the same machine another user logged into windows? (to see if it is FF related or user profile related)
you can also install some previous version of FF to check if it will work under that version without problems:
http://www.oldapps.com/firefox.php

also, try to clear cache/history etc
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dovidfCEOAuthor Commented:
"Did you try on the same machine another user logged into windows? (to see if it is FF related or user profile related)"

It was under a different user on the network machine

"you can also install some previous version of FF to check if it will work under that version without problems:"

Won't that wipe my current version?

"also, try to clear cache/history etc "

How do I clear the cache? Why would clearing history make any difference?
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Marc ZCommented:
Does it work in IE?  Trying to determine if it is a firewall issue or a Firefox issue.  What extensions do you have installed and are any of them installed on both these computers you've tested on?
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dovidfCEOAuthor Commented:
It works in Chrome. I've mentioned that I ran it in safe mode without any extensions
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Marc ZCommented:
I understand,  but I've seen where Firefox's Safe mode doesn't truly reset Firefox to its default settings.  
To confirm,  this is all videos on you tube,  not just certain ones,  correct?
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dovidfCEOAuthor Commented:
All videos on youtube don't work
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dovidfCEOAuthor Commented:
I fixed it by adding Greasemonkey and the Youtube html5 kiss to force html5.

Shockwave currently doesn't work with youtube.
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dovidfCEOAuthor Commented:
This is the change that worked
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