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    • Can get our 64-bit version by default

      • Users on 64-bit Windows who download Firefox can get our 64-bit version by default. That means you get a more secure version of Firefox.
      www.mozilla.org/en-US/firefox/browsers/windows-64-bit/
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  2. How do you get 64-bit Firefox? If you’re running 64-bit Windows (here’s how to check), your Firefox may already be 64-bit. Check your Firefox version (in the “About Firefox” window) and look for “(32-bit)” or “(64-bit)” after the version number:

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  3. Aug 27, 2021 · To see if the 32-bit or 64-bit version of Firefox is installed, locate Mozilla Firefox in the list of programs. The program name will be followed by the the bit version and language, in parentheses. If the program name contains x86, the 32-bit version of Firefox is installed.

    • Using the About Firefox Box
    • Using the Troubleshooting Information Page
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    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.

    If you're running a 32-bit version of Firefox, it will say "(32-bit)" next to the version number on the About Mozilla Firefox box.

    If you don't want Firefox to automatically update right now, you can check whether Firefox is 32-bit or 64-bit on the Troubleshooting Information page. To do this, 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 "Troubleshooting Information" option.

    The Troubleshooting Information page displays on a new tab. Look at the "User Agent" section under Application Basics. If it says "WOW64", you're running the 32-bit version of Firefox.

    If it says "Win64", you're running the 64-bit version.

    If the User Agent section on the Troubleshooting Information page doesn't say either "WOW64" or "Win64", then you're running a 32-bit version of Windows, and you cannot run a 64-bit version of Firefox.

    If you use Chrome, you can also check whether you are running a 32-bit or 64-bit version of Chrome.

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  4. Jan 8, 2016 · How to tell if Firefox is 32-bit or 64-bit. Mozilla published the Windows 64-bit installer for Firefox to the Download page with yesterday’s release of Firefox 43.0. You must have a 64-bit version of Windows to take advantage of the new version of the browser.

  5. Jan 27, 2024 · If you have a 64-bit version, it will be explicitly mentioned next to the version number. If it's a 32-bit version, it will not be specified, indicating that it's a 32-bit application. By following these simple steps, you can easily determine whether your Firefox browser is 32-bit or 64-bit.

  6. Mar 16, 2017 · When you upgraded Firefox to 64-bit, the Firefox entries in the Start menu list and the shortcuts on the desktop and Taskbar are replaced with calls to the 64-bit version of Firefox. You don't need to do anything further, but if you want to uninstall the 32-bit version of Firefox, you can.

  7. Available in over 90 languages, and compatible with Windows, Mac and Linux machines, Firefox works no matter what you’re using or where you are. Make sure your operating system is up to date for the best experience. Review system requirements.

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