_hot_ - Browser.cache.memory.capacity

Enables or disables caching to your local storage drive. If you have an ultra-fast internet connection and want to prevent disk writes on an SSD, some users turn this to false and rely solely on an expanded memory cache. browser.sessionhistory.max_total_viewers Type: Integer

The value you set for browser.cache.memory.capacity determines how much of your precious RAM is dedicated to this task. Setting it too high could starve other applications (or even Firefox itself) of memory, leading to system slowdowns. Setting it too low may prevent the cache from being effective.

Every millisecond counts when browsing the web. To speed up page loading, Mozilla Firefox stores data like images, scripts, and stylesheets in your computer's short-term memory (RAM). The specific setting controlling this behavior is . Browser.cache.memory.capacity

No. Firefox also uses a disk cache ( browser.cache.disk.capacity ). Setting the memory cache to 0 only disables RAM caching.

Firefox maintains two separate caching systems, and understanding their differences is crucial for optimal configuration: Enables or disables caching to your local storage drive

Typically, the automatic memory cache ranges from on a modern machine. This automatic balancing prevents excessive memory usage while still delivering excellent performance.

Note: Setting the value higher than 1048576 (1 GB) is rarely beneficial and can lead to browser instability, as the browser engine is optimized to handle moderate cache sizes efficiently. Companion Settings to Consider Setting it too high could starve other applications

One experienced Firefox user reported excellent results after setting browser.cache.memory.capacity to 512000 (500 MB) while disabling disk cache entirely. Their strategy was based on the observation that "on-disk cache with several days (or weeks) old content is almost entirely useless," and that the most beneficial cache is what you fetch and reuse within a single browsing session.