Browser.cache.memory.capacity Here

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).

it

This article explores what this preference does, how it interacts with the browser's multi-layered caching architecture, how to optimize it for different hardware configurations, and why you might (or might not) want to change it. Browser.cache.memory.capacity

: Stores data directly in your RAM. It is extremely fast but volatile, meaning it is cleared whenever the browser or computer restarts. You have 32GB or 64GB of RAM

The default setting ( -1 ) is correct for the vast majority of users. Mozilla’s engineers have spent years fine-tuning the adaptive algorithm to balance responsiveness against memory pressure. it This article explores what this preference does,

: A custom limit set in Kilobytes (KB) . For example, entering 524288 would cap the memory cache at 512 MB. How to Modify It Open your browser and type about:config in the address bar. Search for browser.cache.memory.capacity . Double-click the entry and enter your desired value in KB.