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whydoe s firefox continnue to use more CPU resource and Memory while ostensibly sitting idle?

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Firefox seems to use more and more CPU cycles and Memory as it sits "idle". Now I know it is not totally idle but I'm not scrolling through a website or searching. After clearing caches, it will go back to around 20% CPU usage and 400 MB memory. AFter a few minutes , CPU usage goes to 60%+ and just under 2,000 MB memory. It is especially "greedy" while reading news items on the Yahoo home page.