Browser.cache.memory.capacity

This is the master power switch for the entire memory cache system. If this is set to false , your browser.cache.memory.capacity value is meaningless. This boolean (true/false) preference determines whether Firefox is allowed to store any data in RAM. By default, it is set to true .

is an integer preference located in the Firefox configuration editor ( about:config ). It dictates the size of the Memory Cache .

Any reason not to make more RAM available for browser cache? Browser.cache.memory.capacity

"Hold the line!" DocShell shouted. "The gallery images are still coming!"

The browser cache memory capacity is used to store a variety of resources, including: This is the master power switch for the

: Allows multi-tab power users to instantly flip between back-and-forward navigation histories without experiencing a single millisecond of asset reloading lag.

For modern work systems boasting 16 GB, 32 GB, or more of system memory, the default automatic settings can occasionally prove too conservative. By default, it is set to true

Firefox determines its default memory cache capacity using a built-in formula tied to your physical memory:

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

Currently, browser.cache.memory.capacity is a static, hidden preference. Users don’t know the optimal value for their system; too low hurts performance, too high wastes RAM. Web apps and images compete for memory without intelligent prioritization.