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Whenever i open a youtube video, firefox goes really slow and often stop working. Any suggestions?

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I have installed the plugin extension, but still whenever a youtube video is on firefox is like drop dead.

Stop working and lag awfully.

I have installed the plugin extension, but still whenever a youtube video is on firefox is like drop dead. Stop working and lag awfully.

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There are some compatibility issues between the latest Flash player and some Firefox add-ons or settings. Could you see whether anything in this article helps: Flash 11.3 doesn't load video in Firefox.

You might also consider disabling the new protected mode in Flash 11.3. See this support article from Adobe under the heading "Last Resort": Adobe Forums: How do I troubleshoot Flash Player's protected mode for Firefox?