How to Upgrade Firefox from 32-bit to 64-bit in Windows Without Reinstalling

Most web browsers are installed in Windows as 64-bit versions by default, Firefox being the exception. If you installed the default download of Firefox, you have the 32-bit version, not the 64-bit version, even if you’re running a 64-bit version of Windows.

Say you recently got a new Windows computer. After installing the 32-bit version of Firefox from the main page, you installed your favorite add-ons, restored your backed up bookmarks, and even set up multiple profiles for personal and work purposes. But, now you want to upgrade to the 64-bit version of Firefox for better performance. You could uninstall the 32-bit version and then install the 64-bit version, but doing so will remove your Firefox user data, such as saved passwords, bookmarks, settings, extensions, and themes.

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You could back up your profile folders from the 32-bit version of Firefox and then restore them after uninstalling Firefox and installing the 64-bit version. But that’s a bit of a hassle, and there is an easier way.

NOTE: Firefox 64-bit can only be installed on 64-bit Windows. If you’re not sure which version of Windows you’re running, you can easily check. If you’re running 32-bit Windows, you cannot upgrade Firefox to 64-bit.

If you’re not sure if you’re running 32-bit or 64-bit Firefox,…

How to Check if You Are Running a 32-bit or 64-bit Version of Firefox

Firefox is available in both 32-bit and 64-bit versions for Windows 7, 8, and 10. If you’re curious which version you’re running, we’ll show a couple of easy ways to find out.

Using the About Firefox Box

The simplest method for finding this information is opening the About Firefox box. However, before continuing, be aware that opening the About Firefox box causes Firefox to automatically update, if there’s an available update. So, if you’d rather not update Firefox right now, skip to the next section for another easy method.

To check if Firefox is 32-bit or 64-bit using the About Firefox box, click the Firefox menu in the upper-right corner of the window and then click the Help icon at the bottom of the menu.

On the Help pane that slides out, click the “About Firefox” option.