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Specify the memory cache usage
Normally, Firefox determines the memory cache usage dynamically based on the amount of available memory. To specify a specific amount of memory cache, use about:config to add the Integer preference browser.cache.memory.capacity, and set the value:

-1
(default) Determine the amount of memory cache dynamically.

0
None.

n
Memory capacity in kilobytes. For example: 4096.

To disable the memory cache completely, use about:config to set the preference browser.cache.memory.enable to false.