After installing Mozilla Firefox 20.0 with Adobe Flash Player 11.6, YouTube videos won't load properly.

YouTube videos worked fine before installing Adobe Flash Player. When installed the screen flickers after one second, rewinds to the beginning, then plays normally. This doesn't occur when I use Internet Explorer. I have reinstalled both Mozilla Firefox and Adobe Flash Player many times but nothing seems to work . Downgrading Adobe Flash Player didn't work either. It seems like Firefox is the problem but I'm not completely sure.

Hi All,
Thanks a lot "cor-el". I also suffered from the above issue. And after I disabled the protected mode by editing "mms.cfg" file the issue got resolved. Now flash player is working fine.
Please use this link for more details : http://kb.mozillazine.org/Flash#Troubleshooting

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