Browser.cache.memory.capacity Updated May 2026

The value of browser.cache.memory.capacity is measured in kilobytes (KB). When Firefox starts, it allocates a portion of memory based on this value. As you browse the web, Firefox stores cache entries in this allocated memory. When the cache grows, Firefox uses a least-recently-used (LRU) algorithm to evict older cache entries to make room for new ones.

browser.cache.memory.capacity is a configuration parameter in Firefox that controls the amount of memory allocated for caching web pages, images, and other web content. Browser.cache.memory.capacity

When you visit a website, Firefox stores some of the content in memory (RAM) so that if you revisit the same page or navigate to a similar page, it can load faster. This is known as caching. The browser.cache.memory.capacity parameter determines how much memory is allocated for this caching. The value of browser