Firefox doesnot plays the youtube videos while chrome and internet explorer does. I have tried in safemode of firefox too..

Firefox fails to play youtube videos.. It shows me an error occured . But youtube works fine in chrome and IE. I tried with latest version of flash player and firefox and also in safe mode of firefox. Also i tried with different versions of flash players and old firefox versions. Also tried after uninstalling flash player.. Nothing worked.. Rarely it gets played and problem occures again afterwards.. I deleted all cookies.. History.. Also refreshed windows... Help...?