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Will Firefox work on 64-bit operating systems, like 64-bit Windows 7 or Mac Snow Leopard?

{for win} Firefox will work on 64-bit versions of Windows, but it is not a 64 bit application. See [http://www.mozilla.com/firefox/system-requirements.html system requirements] for details on all supported systems. For details on how to install, see [[Installing Firefox on Windows]]. Mozilla is working on providing 64-bit versions, but no schedule is set. {/for} {for mac} {for not fx35} Firefox 4 is an i386/x86_64 universal binary. The default architecture on Mac OS X 10.6 and above is 64-bit. The default architecture on Mac OS X 10.5 is i386. See [http://www.mozilla.com/firefox/system-requirements.html system requirements] for details on supported systems. For details on how to install, see [[Installing Firefox on Mac]]. {/for} {for fx35} Firefox 3 will work on 64-bit versions of Mac OS X, but it is not a 64 bit application. See [http://www.mozilla.com/firefox/system-requirements.html system requirements] for details on supported systems. Firefox 4 will run in 64-bit mode. For details on how to update Firefox, see [[Updating Firefox]]. {/for} {/for} {for linux} Firefox will work on 64-bit versions of Linux, but it is not a 64 bit application. See [[Installing Firefox on Linux]] for details on obtaining the proper version of Firefox for your Linux distribution. Mozilla is working on providing 64-bit versions, but no schedule is set. {/for}