If you run it on a 64-bit Windows system, it can use up to 4 Gigabytes of RAM. If you are running Firefox on a 32-bit Windows operating system, it can use 3 Gigabytes of memory at the most. That's the reason why you won't see 4 Gigabytes of available RAM on 32-bit versions of Windows even though you have installed that much, as part of it is used by other components. Technically, the 4 Gigabyte limit refers to the addressable memory space which the installed RAM, video cards, PCI memory range and other factors attribute to. Windows 8 Professional 64-bit supports 512 Gigabyte for example, while Windows 7 Professional 64-bit 192 Gigabyte.
How much more depends on the version you are using.
The physical memory limit of 32-bit versions of Windows is 4 Gigabyte, while 64-bit versions of Windows support more than that. One of the advantages of 64-bit software is that it may have more memory at its disposal, provided that that enough is installed on the 64-bit operating system.
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