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Why doesn't firefox open youtube videos, istead whole server get jam.

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Only way to get out is stop process. When open videos sound and music is playing, but video stops after 0-2 second. Then firefox is jammed, nothing works.

Only way to get out is stop process. When open videos sound and music is playing, but video stops after 0-2 second. Then firefox is jammed, nothing works.

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Make sure that you allow the plugin-container in the firewall.

You can also try to disable the hardware acceleration in the Flash Player.
See:

Flash "Display settings" window: