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

[[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://blog.mozilla.org/futurereleases/2015/12/15/firefox-64-bit-for-windows-available/ this blog post] to learn more about 64-bit Firefox. If you want to switch to the 64-bit version of Firefox, see [[How to switch from 32-bit to 64-bit Firefox]]. Not sure whether you're running 32-bit or 64-bit Firefox? This article explains how to find out. __TOC__ {for fx51} <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=597738 --> = About Firefox window = You can [[Find what version of Firefox you are using|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 and automatically download an updated version of Firefox, if available. For more information, see [[Update Firefox to the latest version]].{/note} {/for} =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 |} =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. If you don't want both you can uninstall the unwanted version. The Firefox uninstaller doesn't remove any of your [[Profiles - Where Firefox stores your bookmarks, passwords and other user data|Firefox user 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 -->