Firefox can't play any video

Every time I watch video on youtube or any other site, the browser stop responding. the problem occur also when i tried to play a flash game online. please help.

Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
Make sure that you allow the plugin-container process in the firewall.
*http://kb.mozillazine.org/Plugin-container_and_out-of-process_plugins
You can check for problems with current Flash plugin versions and try these:
*disable protected mode in Flash 11.3 and later
*disable hardware acceleration in the Flash plugin
*http://kb.mozillazine.org/Flash#Troubleshooting

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