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Thanks in advance for your help!

Hi burakb,

If you have RealPlayer installed - update it, also, Turn off hardware acceleration and "disable the hardware acceleration" in the Flash Player too :

http://helpx.adobe.com/flash-player/kb/video-playback-issues.html

http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html , and try again.

http://kb.mozillazine.org/Safe_mode

thank you

Thank you ideato. Disabling hardware acceleration solves my problem. Now everything works fine. But is it going to decrease the performance of firefox since I will not use hardware acceleration?

Hardware acceleration is using GPU when it’s possible to help page-drawing operations faster, but the increase of performance is negligible (if working well).

see for more info:

https://wiki.mozilla.org/Platform/GFX/HardwareAcceleration

https://hacks.mozilla.org/2010/09/hardware-acceleration/

EDIT : same in flash player http://en.wikipedia.org/wiki/Hardware_acceleration

thanks again

OK. Thank you again...