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By default, Firefox includes a copy of the XUL.mfl (Windows), XUL.mfasl (Unix), or XUL FastLoad File (Macintosh) file. This is the Mozilla FastLoad cache that resides in the profile area. You can set the following preference to prevent it from being used:-

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To turn off the memory and disk browser caches completely, set these preferences:

browser.cache.memory.enable    /* set to false, default = true */
browser.cache.disk.enable       /* set to false, default = true */

Turning these preferences off guarantees that Firefox will make an HTTP request for every URL it is asked to display.

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