Browser.cache.memory.capacity ((top))

Unlike the (which stores website data on the hard drive for long-term storage), the Memory Cache stores recently accessed web data in the computer’s RAM.

In the search bar at the top of the about:config page, type: browser.cache.memory.capacity Browser.cache.memory.capacity

There are two primary scenarios where a user might consider overriding the default: Unlike the (which stores website data on the

You have 32GB or 64GB of RAM. You typically keep Firefox open for days with 50+ tabs. You frequently revisit complex web applications (Slack, Figma, Gmail). Browser.cache.memory.capacity

Set the value to 0 to effectively disable the memory cache entirely.