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I've noticed this especially when I youtube or video stream for a while. Switching between tabs takes 3-4 seconds. Definitely a memory leak! Is it a general problem or addon specific?

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I've noticed this especially when I youtube or video stream for a while. Switching between tabs takes 3-4 seconds.

Definitely a memory leak! Is it a general problem or addon specific?

Also, when I try to close firefox and restart it, the process doesn'y get killed with the normal Command + Q in Mac. I need to use Force Quit instead.

I've noticed this especially when I youtube or video stream for a while. Switching between tabs takes 3-4 seconds. Definitely a memory leak! Is it a general problem or addon specific? Also, when I try to close firefox and restart it, the process doesn'y get killed with the normal Command + Q in Mac. I need to use Force Quit instead.

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Try updating Flash. You appear to be running an older version dating from September 2010 which might be the cause of the problem. Download from http://get.adobe.com/flashplayer/

If the problem persists after updating, try running Firefox in Diagnose Firefox issues using Troubleshoot Mode. If it functions properly in that configuration, then one of your add-ons is the culprit.