Browser.cache.memory.capacity |verified| Jun 2026

To get the most out of your memory cache, ensure the following related preferences are also set correctly in about:config :

The keyboard clacked. about:config typed into the address bar. A risky move, the advanced settings. Browser.cache.memory.capacity

Open Firefox, type about:config in the address bar, and press Enter. Click "Accept the Risk and Continue." To get the most out of your memory

Because this is an advanced performance tweak, the setting is located in Firefox's hidden configuration editor. Open Firefox, type about:config in the address bar,

While browsers have automatic management systems, power users often turn to about:config to fine-tune performance. One of the most important, yet misunderstood, settings for memory management is . What is browser.cache.memory.capacity ?

: If you have a computer with limited RAM (e.g., 2GB or less), capping this value can prevent the browser from "hogging" memory and slowing down other applications.