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By default, on Windows, Firefox is a 32-bit application. This means that it is limited to using at most 4 GiB of memory, even on machines that have more than 4 GiB of physical memory (RAM). In fact, depending on the OS configuration, the limit may be as low as 2 GiB. Now, 2–4 GiB might sound like a lot of memory, but it’s not that unusual for power users to use that much. This includes: users with many (dozens or even hundreds) of tabs open; users with many (dozens) of extensions; users of memory-hungry web sites and web apps; and users who do all o