If you hapeen to run the Firefox web browser portable-style, or you notice the browser has been acting slightly sluggish as of late on your computer, setting a manual limit for what the cache can hold may speed up your browser a bit. Doing this is no guarantee it will make the browser lightning fast, but it does save you from having to empty the cache manually every so often when the browser can do it on its own once it hits the limit you set.
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