Browser.cache.memory.capacity ^new^

If it doesn’t exist, you can as a new integer preference.

The stutter vanished. The browser smoothed out. The RAM usage climbed, but it didn't crash. The Operating System grudgingly handed over the physical pages. The User sighed in relief, scrolling effortlessly through the gallery. Browser.cache.memory.capacity

This preference dictates exactly how much of your computer’s RAM (Random Access Memory) Firefox is allowed to use for storing web content temporarily. Unlike disk-based caches that save assets to your hard drive or SSD, the memory cache is the elite, lightning-fast tier of storage. When configured correctly, it can make page reloads feel instantaneous. When left at its default—or configured incorrectly—it can lead to sluggish performance, excessive memory usage, or wasted resources. If it doesn’t exist, you can as a new integer preference

To modify this setting in Firefox:

Before adjusting browser.cache.memory.capacity , one must understand where memory caching fits within Firefox’s architecture. Firefox employs a three-tiered caching strategy: The RAM usage climbed, but it didn't crash