Question

Firefox became really slow, sluggish and monopolizing CPU (92% usage) and RAM (8GB) after upgrading to 18 .Mac Lion OS X 10.8.2 MacBook 13inch Retina 11/2012

I upgraded two days ago to Firefox 18 from 17. Firefox used to run very smoothly on my system. Now the application hangs, the cursor and the scrolling lag, and when I type in text in form areas there is a noticeable delay. I ran a complete virus scan with Sophos and looked at the resource usage. The CPU usage (this is a dual core processor) nears 92% for Firefox. Same for the memory (I have 8GB of RAM) even when Firefox is the only application running.

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