Why Firefox not working with many Youtube videos?

I use Firefox 13.0.1 on a Mac OS X 10.6.8. Beginning from August, many of the Youtube videos cannot be played, with the error message:
" The Adobe Flash Player is required for video playback. Get the latest Flash Player"
I clicked the clickable "Get the latest Flash Player" and installed it. But the same error message continues to show up. I repeated the process 3 times, the problem remains.
The Safari on my machine, however, has never had the above problem.
Could you let me know how to make these Youtube videos play with Firefox?
Thank you!

You could try uninstalling Flash completely and go directly to the Adobe website and download it. If that doesn't work I would uninstall Firefox and re-install it and see if the problem continues.
All the best,
Knownware

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