Using Firefox with a 64-bit Operating System

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Firefox will work on 64-bit versions of Windows, but it is not a 64-bit application. See system requirements for details on all supported systems.

For details on how to install, see How to download and install Firefox on Windows.

Mozilla is working on providing 64-bit versions for Firefox 5.

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 system requirements for details on supported systems.

For details on how to install, see How to download and install Firefox on Mac.

Firefox 3.6 will work on 64-bit versions of Mac OS X, but it is not a 64-bit application. See system requirements for details on supported systems.

Firefox 4 will run in 64-bit mode. For details on how to update Firefox, see Update Firefox to the latest version.

There is a x86_64 binary of Firefox 4 to run on 64-bit versions of Linux. See system requirements for details on supported systems.

For details on how to install, see Install Firefox on Linux.

Firefox 3.6 will work on 64-bit versions of Linux, but it is not a 64-bit application. See system requirements for details on supported systems.

Firefox 4 will run in 64-bit mode. For details on how to update Firefox, see Update Firefox to the latest version.

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