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Most Youtube videos have an error

Answers: Have 4 answers
This started a few days ago, I have no idea how it started. Basically very many Youtube videos don't start in Firefox. They work fine in Chrome (although they don't seem to load instantly, takes a while to start). Here's a screenshot: http://i.imgur.com/z5XP0zU.png
What I've tried:
Reinstall Firefox
Reinstall Flash
Clear cache in both Firefox and Flash
New profile in Firefox
Change to HTML5 on Youtube (and turn off Flash in plug-ins)
The Youtube HTML5 page (https://www.youtube.com/html5) looks like this http://i.imgur.com/KlOSgOR.png. In Chrome it's all green.
Please help.
The best answer: If I set media.mediasource.enabled = true, Youtube stops working completely if I have enabled html5. There's a never-ending loading screen on the flash player. The other combinations of html5 on and off and this true or false appear to be the same (error).
Yes I have cleared both cookies and cache, browser and flash.


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