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Firefox on Mac OS X gets spinning wheel after several days of use

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I have the latest version of Firefox, 8.0.1 and Mac OS X. After running Firefox for several days to a week or more, Firefox starts to become really slow and I would get the spinning wheel for a few seconds when I click a link or click on a field box. Then I have to reboot my computer and it is fixed for another week or so and the spinning wheel starts up again.

I have the latest version of Firefox, 8.0.1 and Mac OS X. After running Firefox for several days to a week or more, Firefox starts to become really slow and I would get the spinning wheel for a few seconds when I click a link or click on a field box. Then I have to reboot my computer and it is fixed for another week or so and the spinning wheel starts up again.

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What is the memory usage of Firefox when this happens?

You can check the on the about:memory page via the location bar.
That page also has a button ant the bottom to reduce the memory usage.