Browser.cache.memory.capacity Info

Firefox uses a heuristic algorithm when browser.cache.memory.capacity = -1 :

The configuration setting is an advanced preference in Firefox-based browsers (accessible via about:config ) that manually determines the maximum amount of system RAM used for the memory cache. Core Functionality

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Enjoy the power while it lasts, but do not build a critical workflow that depends on manually setting this value.

One experienced Firefox user reported excellent results after setting browser.cache.memory.capacity to 512000 (500 MB) while disabling disk cache entirely. Their strategy was based on the observation that "on-disk cache with several days (or weeks) old content is almost entirely useless," and that the most beneficial cache is what you fetch and reuse within a single browsing session. Firefox uses a heuristic algorithm when browser

This configuration ensures Firefox writes no cache data to your disk, only using RAM for temporary storage. The trade-off is that all cached data is lost when you close the browser.

The browser.cache.memory.capacity setting specifically controls the size of the memory cache. If you share with third parties, their policies apply

A great middle-ground for 8 GB RAM systems to guarantee snappy performance. 524288