[[Template:WindowsOnly]] Both 32-bit and 64-bit versions of Firefox are available for 64-bit operating systems, on Windows 7 and above. See [https://www.mozilla.org/firefox/windows-64-bit/ this blog post] to learn more. Not sure whether you're running 32-bit or 64-bit Firefox? This article explains how to find out. __TOC__ <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=597738 --> = About Firefox window = You can find what version of Firefox you are using in the About Firefox window. Click the Firefox menu button [[Image:New Fx Menu]], click help [[Image:Help-29]] and select {menu About Firefox}. (32-bit) or (64-bit) will be shown under the Firefox name, after the version number. {note}'''Note:''' Opening the About Firefox window will, by default, start an update check. If an updated version of Firefox is available, it will be automatically downloaded. For more information, see [[Update Firefox to the latest release]].{/note} {for not fx69}<!-- https://bugzilla.mozilla.org/show_bug.cgi?id=1559747 --> =User agent= The user agent identifies your browser to websites and contains information about your operating system and browser version. This can be an easy way to identify which version of Firefox is running. To find your user agent, click the Firefox menu button [[Image:New Fx Menu]], click help [[Image:Help-29]] and select {menu Troubleshooting Information}. This will open the [[Use the Troubleshooting Information page to help fix Firefox issues|Troubleshooting Information page]]. [[Image:Fx49UserAgent-win64]] In the '''Application Basics''' section of this page, find the '''User Agent''' entry and look at the information enclosed within the parentheses. {| !If you see!!What it means |- |Win64; x64||64-bit Firefox |- |WOW64||32-bit Firefox on 64-bit Windows |- |(neither of the above)||You're running 32-bit Windows and it will not run 64-bit Firefox |} {/for} =Windows program listing= You can also check the installed version of Firefox from the Windows list of installed programs. {for not win10}Open the Windows Control Panel, click on {menu Programs}, then {menu Programs and Features}.{/for}{for win10}Open Windows Settings, click on {menu System}, then {menu Apps & features}.{/for} This will show you a list of software that is currently installed on your computer. <!-- [[Image:Win7Programs]] --> 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 include the Firefox version and, in parentheses, the bit version and language. If the program name contains '''x86''', the 32-bit version of Firefox is installed. If the program name contains '''x64''', the 64-bit version of Firefox is installed. {note}'''Note:''' You can have both 32-bit and 64-bit Firefox program versions listed, if you installed one version without uninstalling the other. To uninstall the unwanted version, see [[Uninstall Firefox from your computer]]. The Firefox uninstaller doesn't remove any of your [[Profiles - Where Firefox stores your bookmarks, passwords and other user data|Firefox user profile data]], such as passwords or bookmarks.{/note} <!-- References: https://www.404techsupport.com/2015/12/tell-firefox-32-64/ http://superuser.com/questions/1023356/where-to-see-which-firefox-version-is-running-64-bit-or-32-bit and https://bugzilla.mozilla.org/show_bug.cgi?id=1120124 -->

Both 32-bit and 64-bit versions of Firefox are available for 64-bit operating systems, on Windows 7 and above. See this blog post to learn more.

Not sure whether you're running 32-bit or 64-bit Firefox? This article explains how to find out.

About Firefox window

You can find what version of Firefox you are using in the About Firefox window. Click the Firefox menu button , click help and select About Firefox. (32-bit) or (64-bit) will be shown under the Firefox name, after the version number.

Windows program listing

You can also check the installed version of Firefox from the Windows list of installed programs. Open the Windows Control Panel, click on Programs, then Programs and Features.Open Windows Settings, click on System, then Apps & features. This will show you a list of software that is currently installed on your computer.

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 include the Firefox version and, in parentheses, the bit version and language. If the program name contains x86, the 32-bit version of Firefox is installed. If the program name contains x64, the 64-bit version of Firefox is installed.