Browser.cache.memory.capacity 🎁 Premium

Taming the Memory Beast: How to Tweak browser.cache.memory.capacity

• If set to -1 (Default): Firefox uses a dynamic, adaptive algorithm. It automatically calculates memory cache size based on your total system RAM. Typically, this results in a cache between 10 MB and 50 MB (or roughly 1/8th of your available RAM, capped).
• If set to 0: The memory cache is disabled entirely. No resources are stored in RAM. Every back/forward navigation or page reload triggers a fresh disk or network fetch.
• If set to a positive integer (e.g., 102400): This forces Firefox to allocate exactly that many kilobytes (e.g., ~100 MB) of RAM for the cache.

How to Verify the Setting Works

1. Open Firefox.
2. Visit several websites.
3. Go to about:cache in the address bar.
4. Click Memory cache device.
5. Check:

   2. Increasing the Cache for a RAM Disk (Power Users)

   Some advanced users place Firefox’s entire cache onto a RAM disk (a virtual drive stored entirely in RAM) to reduce SSD writes or for theoretical performance gains. In such cases, they might disable the normal memory cache (0) or increase it (browser.cache.memory.capacity) to align with the RAM disk size. Browser.cache.memory.capacity