Why youtube's video doesn't work on Firefox ?

I open a video to watch but its says ( Hello, you either have JavaScript turned off or an old version of Adobe's Flash Player. Get the latest Flash player. )

I downloaded flash player again !
i downloaded java again !

but its not working what's wrong ??

Note: the video works fine on Internet Explorer
You have to download Adobe Flash Player or update your version!
I have the same problem, glad to know I'm not the only one.
try using IE for youtube until a new Flash version for Firefox comes out

edit: erase the cookies, that solved the problem
you must download and then install the player and java by double clicking the download tab which also appears when pushing ctr-j
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