: Reduces the browser's memory footprint, which is beneficial for systems with limited RAM, but increases load times as the browser must frequently re-decode images or re-fetch data from the slower disk cache.
While modern browsers are excellent at managing memory on their own, understanding browser.cache.memory.capacity empowers you to optimize your browsing experience to match your specific hardware and privacy needs. Firefox/Tweaks - ArchWiki Browser.cache.memory.capacity
| Value | Meaning | Use Case | | :--- | :--- | :--- | | | Automatic (Dynamic) | Recommended for most users. The browser scales the cache based on total system RAM (e.g., using more RAM on a 32GB system vs. an 8GB system). | | 0 | Disabled | Prevents the browser from using RAM for caching. Not Recommended. This forces the browser to re-parse resources constantly, significantly slowing down navigation. | | Any Positive Integer | Manual Limit (in KB) | Sets a hard limit. Useful for limiting RAM usage on older machines. Example: 1048576 sets the limit to roughly 1 GB. | : Reduces the browser's memory footprint, which is
The existing pref remains as the source of truth, but a background service overwrites it based on the new rules. About:config retains direct editing for power users. The browser scales the cache based on total system RAM (e
In recent versions of Firefox, the transparency of this setting has sparked debate. While the parameter can still be manually added or modified via the Advanced Preferences (about:config) page
Any reason not to make more RAM available for browser cache?
serves as a critical lever for performance tuning. This setting determines the maximum amount of Random Access Memory (RAM) the browser allocates to store decoded images, scripts, and objects from recently visited websites. The Mechanics of Memory Caching