Browser.cache.memory.capacity -

For the vast majority of users, the default setting ( -1 ) is optimal. Firefox automatically calculates an appropriate memory cache size based on:

: Stores data on your hard drive or SSD. It is persistent but relatively slow to access. Browser.cache.memory.capacity

On older systems or devices with limited memory (like a low-end laptop or a Raspberry Pi), Firefox can sometimes be "memory hungry". If you find that your entire system slows down or hits its swap file when Firefox is open, manually capping the memory cache can prevent the browser from crowding out other essential system processes. Related Settings for Power Users For the vast majority of users, the default

Historically, the MozillaZine community suggested these starting points for older hardware: Physical RAM Suggested Cache Value (KB) -1 (Automatic) Related Settings for Better Performance On older systems or devices with limited memory

Double-click the value to edit it, or use the plus/pencil icon to create it if it doesn't exist. browser.cache.memory.enable for these changes to take effect. mozillaZine Related Configuration Tips Checking Current Usage

In the architecture of modern web browsers—specifically those based on the Gecko engine like Firefox—the parameter browser.cache.memory.capacity