Browser.cache.memory.capacity May 2026
Title: The Limit of Forgetting
🔧 When to set a fixed size
- You want predictable memory usage
- Automatic tuning isn’t working well on your OS
Think of your browser like a chef. The Hard Drive (Disk Cache) is the deep freezer in the basement—it holds everything, but it takes forever to go down and get it. The RAM (Memory Cache) is the cutting board right in front of the chef. The Backstory: Speed vs. Space Browser.cache.memory.capacity
"Hold the line!" DocShell shouted. "The gallery images are still coming!" Title: The Limit of Forgetting 🔧 When to
Summary
- Most users: Leave at
-1(automatic). - Power users with RAM to spare: Set
131072(128 MB) for potentially faster back/forward navigation. - Low-RAM systems: Reduce to
25600(25 MB) or0if memory is critical.
Goal: Set the value to 0 to effectively disable the memory cache entirely. You want predictable memory usage Automatic tuning isn’t