Mozilla fox won't play videos on YouTube and other websites. Why is this?

I went onto YouTube and tried to watch videos but a message popped up where the video would be and said to check back later. I went on google chrome and it played immediately so I know it wasn't something wrong with YouTube. I have the latest version of adobe flash player so what else could be wrong?

You can check for problems caused by a recent Flash 11.3 update and possibly downgrade to Flash 11.2 or 10.3.
*https://support.mozilla.org/kb/flash-113-doesnt-load-video-firefox
*https://support.mozilla.org/kb/flash-113-crashes
*http://blogs.adobe.com/asset/2012/06/inside-flash-player-protected-mode-for-firefox.html

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HI and welcome to Apple Discussions...
Uninstall then reinstall the most recent version of Flash which you need for YouTube.
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'''If you are running Adblock Plus...'''
While on a YouTube page, right click the ABP icon and "open blockable items".
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Recent crashes of certain multimedia contents (this includes Youtube videos, certain flash games and other applications) in conjunction with Firefox 13 are most probably caused by a recent Flash 11.3 update and/or a malfunctioning Real Player browser plugin.
In order to remedy the problem, please perform the steps mentioned in these Knowledge Base articles:
[[Flash Plugin - Keep it up to date and troubleshoot problems]]
[[Flash 11.3 crashes]]
[[Flash 11.3 doesn't load video in Firefox]]
Other, more technical information about these issues can be found under these Links:
http://forums.adobe.com/thread/1018071?tstart=0
http://blogs.adobe.com/asset/2012/06/inside-flash-player-protected-mode-for-firefox.html
Please tell us if this helped!

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Model Name:                    Mac Pro
OS:                                    SL 10.6.8
Model Identifier:               MacPro3,1
Processor Name:               Quad-Core Intel Xeon
Processor Speed:               2.8 GHz
Number Of Processors:      2
Total Number Of Cores:     8
Memory:                            8 GB

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Hello!
Since the last update for the flash player the player always stops playing videos on youtube after a while and than player swiches back to the side for to choose videos. How to remove the problem?
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Flash Player Help | Installation problems | Flash Player | Windows
Flash Player Help | Installation problems | Mac OS
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Most movies won't play save for youtube and a few others

On Facebook and a lot of website, videos won't play, I just get a black screen when I click on the videos. Youtube is one of the few exceptions, I'd say 1 in 10 website don't work, videos uploaded directly on Facebook for exemple never work.
I though it might be my noscript, or adsblock but I tried every solutions on your support and various forums, didn't change a thing. (e.g. running in safe mode, deleting them, deleting Firefox and re-installing it) So it doens't seem to be an addon problem, unless it install something to deep in my PC for me to remove(the videos did work for a while on Firefox but I don't remember what could have triggered the change).
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Is there anything you might know that is in conflict with Firefox on a PC that cause this problem?
I don't want to go to Chrome.

I did that, I had two version running, though it didn't change anything that I noticed. I still have the same issue.
I know what you meant with the small lego icon, it's not what's happening, I have a simple black screen as if the video was about to start, it just never do - I don't have a loading issue either.
Addtionnal info, I noticed I have two Shockwave in my plugins - no idea if it's related
I also found out I can't remove the hardware acceleration in Flash. Whenever I right click on a flash thing and uncheck the box, as soon as I close the small window, the box has back being checked.
Among other things I tried is in the about:config, the dom.ipc.plugins.flash.disable-protected-mode line, I've set it to TRUE.
I've included 2 images, one of the folder you mentionned, the other is what I get when I click on a cellphone uploaded video. It's not much of a picture, it's only a black screen as I said but just in case it can rule out some stuff.

Videos on yahoo and other websites wont play

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You can check for problems caused by a recent Flash 11.3 update and possibly downgrade to Flash 11.2 or 10.3.
*https://support.mozilla.org/kb/flash-113-doesnt-load-video-firefox
*https://support.mozilla.org/kb/flash-113-crashes
*http://blogs.adobe.com/asset/2012/06/inside-flash-player-protected-mode-for-firefox.html

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this thread might be helpful to you [https://support.mozilla.org/en-US/questions/835924 https://support.mozilla.org/en-US/questions/835924]

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Hello Bruna Camargo,
Thanks for using Apple Support Communities.
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When watching videos on YouTube and other sites, the sound plays for a few seconds and then stops.

I've ensured that the sound is working by pressing the volume up/down buttons and by looking in System Preferences to check it's switched to Internal Speakers, and sound plays through iTunes, so I think it could be something to do with Safari. When I Quit Safari and reopen it the sound tends to work, but then goes off again.
Any ideas or suggestions would be most welcome.
Thank you in advance.

1. http://support.google.com/youtube/bin/answer.py?hl=en&answer=58132
2. System Preferences > Flash > Advanced > Delete All
3. Install Adobe Flash Player.
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Mozilla fox won't play videos on YouTube and other websites. Why is this?

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