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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.

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.