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

[[Template:WindowsOnly]] {for win}{note}'''Note:''' This article applies to Firefox on 64-bit operating systems with Windows 7 or above. See Microsoft's instructions [http://windows.microsoft.com/en-us/windows/which-operating-system here] {for not win10}and [https://support.microsoft.com/kb/827218 here] {/for}to find operating system information for your version of Windows.{/note}{/for} In addition to the 32-bit version of Firefox, a 64-bit version of Firefox is available for 64-bit operating systems, on Windows 7 or above. See [https://blog.mozilla.org/futurereleases/2015/12/15/firefox-64-bit-for-windows-available/ this blog post] for details. This article explains how to determine whether you are using the 32-bit or 64-bit version of Firefox. __TOC__ =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:User Agent Fx42.0]] In the '''Application Basics''' section of this page, find the '''User Agent''' entry and look at the information enclosed within the parentheses. If your user agent contains '''WOW64''', you are running the 32-bit version of Firefox. If your user agent contains '''Win64; x64''', you are running the 64-bit version of 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 the Windows Settings, click on {menu System}, then {menu Apps & features}.{/for} This will load a list of software that is currently installed on your computer. <!-- [[Image:Win7Programs]] --> To determine whether you have the 32-bit or 64-bit version of Firefox 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:''' It's possible to have both 32-bit and 64-bit versions of Firefox installed.<!-- ref: 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 -->{/note}