Youtube videos not playing. I see only a black box. They work on Safari.
I'm running Mac OS 10.6.8, have upgraded to the latest version of Flash Player, and Youtube videos will not play on Firefox 5.0. They will play on Safari. I think it stopped working when I upgraded to Firefox 5.
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I was having this problem too. It is simple for Mac - clear the cache. Go to Firefox preferences, network and clear the cache. It should work then...it did for me.