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

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

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": [http://forums.adobe.com/message/4468493 Adobe Forums: How do I troubleshoot Flash Player's protected mode for Firefox?]

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