Browser.cache.memory.capacity

Firefox determines its default memory cache capacity using a built-in formula tied to your physical memory:

When it comes to browsing performance, few things are as vital—and as misunderstood—as caching. At its core, caching is your browser's strategy for remembering what it has already seen, a digital shortcut to avoid re-downloading the same assets over and over again. Imagine revisiting a news site with the same banner image; instead of downloading that image from the web every single time, your browser loads it from a local cache, making the page appear almost instantly. While you might be familiar with your browser's "clear cache" button, the mechanics of how and where your browser stores this data are much more nuanced, especially in a powerhouse like Firefox. Browser.cache.memory.capacity

Firefox restricts the memory cache to around 14 MB to 18 MB to prevent system crashes. Firefox determines its default memory cache capacity using

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Check about:cache?device=memory . Some users have reported that regardless of the value they set, the displayed maximum storage size remains at 28,672 KB (28 MB). This can occur in certain Firefox versions where the preference is ignored or overridden. If you encounter this, verify that: While you might be familiar with your browser's