Browser.cache.memory.capacity — Latest & Working

: Set this boolean preference to false if you want to completely turn off RAM caching without changing capacity numbers.

The short answer is: Firefox’s automatic cache sizing has been refined over many years and is highly effective on the vast majority of systems. Browser.cache.memory.capacity

Understanding and Optimizing browser.cache.memory.capacity in Firefox : Set this boolean preference to false if

The default value is . In this mode, Firefox automatically decides how much memory to allocate for caching based on your system’s total physical RAM. The exact amounts have evolved over time, but the principle remains: as your computer has more memory, Firefox reserves a larger cache. In this mode, Firefox automatically decides how much

To understand browser.cache.memory.capacity , you must understand its relationship with the disk cache. They serve different purposes and perform very differently.

: Setting this to false forces Firefox to use memory, which can be faster but uses more RAM.

Reading data from RAM is significantly faster than reading it from a solid-state drive (SSD) or a traditional hard drive (HDD). Therefore, a larger memory cache generally translates to faster page load times when you click the "Back" button or revisit a site during the same browsing session.