Firefox won't play videos from YouTube, Hulu, etc. w/latest Flash version.

Despite following both Firefox and Flash directions, Firefox won't play videos from YouTube, Hulu, etc. They either never load or they load and freeze within seconds. Before I got the latest versions of Firefox and Flash, I did not have this problem. So there must be a problem in one or both of them. Since I understand from various websites that this is a widespread problem, can Firefox fix this? It's a major flaw in the latest Firefox version.

'''If you are running Adblock Plus...'''
While on a YouTube page, right click the ABP icon and "open blockable items".
When the window opens at the bottom of the page, right click this line: http://s.ytimg.com/yt/swfbin/watch_as3-vfl9DouAr.swf (or some variation) , then "Disable Filter".

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    '''If you are running Adblock Plus...'''
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    When the window opens at the bottom of the page, right click this line: http://s.ytimg.com/yt/swfbin/watch_as3-vfl9DouAr.swf (or some variation) , then "Disable Filter".

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    ''locking as a dupe of https://support.mozilla.org/en-US/questions/991198''
    Searching support for two nights has led me to an answer because the help is almost always outdated.
    YouTube videos will not play using Firefox on my new desktop computer. I downloaded Flash player (version 12 something) using Firefox 28 after YouTube told me I needed it. After doing that, videos would play for a few seconds, then a message would appear telling the video would not play with a "Learn More" link. The help was too vague to help.
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