A small number of PC users have installed 64-bit Firefox on 64-bit Windows 7/8/10, according to Mozilla. If you are running Windows 10/8/7 64-bit, it’s a good idea to upgrade Firefox 32-bit to 64-bit for better performance.
If you are not sure if you have installed 32 or 64-bit Firefox, you can check the same by following directions mentioned in one of the given below methods.
Following are the five ways to know if you are running 32-bit or 64-bit Firefox on Windows 10/8/7.
Method 1 of 5
Check if you are running 32 or 64-bit Firefox
Step 1: Launch Firefox. Press Alt key to see menus. Click Help menu and then click Troubleshooting information.
Step 2: In the Application Basics section of the troubleshooting information page, look at the provided User Agent information.
Step 3: A WOW64 entry indicates that you are running 32-bit Firefox. Win64; x64 will appear if you have installed Firefox 64-bit.
Method 2 of 5
Use Settings to check if you are running 32 or 64-bit Firefox
This method applies to Windows 10 only.
Step 1: Open Settings. Click System > Apps & features. If you are on Windows 10 Creators Update (14997 or above build), navigate to Apps > Apps & features after opening System.
Step 2: Locate Mozilla Firefox entry. As you can see in the picture below, the type (32 or 64-bit) of Firefox appears next to Mozilla Firefox entry.
Method 3 of 5
Use Control Panel to check if you are running 32 or 64-bit Firefox
Step 1: Type Appwiz.cpl in Start/taskbar search field and then press Enter key to open Programs and Features window.
Step 2: Look for Mozilla Firefox entry. The program name includes the type of Firefox. As you can see in the picture below, I am running x86 (32-bit) version of Firefox on my PC.
Method 4 of 5
Use Task Manager to find if you are running 32 or 64-bit Firefox
Step 1: Run Mozilla Firefox, if not already running.
Step 2: Open Task Manager. To do so, you can either use Ctrl + Shift + Esc hotkey or right-click on an empty spot on the taskbar and then click Task Manager.
Step 3: If you see the stripped-down version of Task Manager, click More details.
Step 4: Under Processes tab, the type (32-bit or 64-bit) appears next to Firefox’s name.
Method 5 of 5
Find if you are running 32 or 64-bit Firefox using File Explorer
Step 1: Open the drive where Windows 10 is installed. The drive where Windows 10 is installed displays Windows logo on it for easy identification.
Step 2: Double-click on Program Files (x86) folder. Check if a folder named Mozilla Firefox folder is located under Program Files (x86) folder. The Mozilla Firefox folder under Program Files (x86) indicates that you are running a 32-bit version of Firefox unless you have both 32-bit and 64-bit installed.
Hope this helps!
kevin says
bad experience with firefox beta. I have ran out of choices. I think they are all bad. I just now switched to windows 8 from 10. on 10 it was terrible so slow and no support. I deleted beta firefox a week ago. I still look for a way to contact them everywhere i go and still havent seen anything. When I came to this page it was quick. I hope it stays that way.
Tom says
You missed the easiest way to tell: to the right side of the address bar, click on the 3 bar icon that opens the menu for options, etc. Click on the question mark icon to the right of Customize. Click on About Firefox. The resulting dialog includes this on my system: 51.0.1 (32-bit)
admin says
@ Ryan
I don’t have an exact figure to share but depending on the number of tabs opened, you should see performance gain up to 30%.
Ryan says
How much more performance can you see if you are using the 64 bit version for Firefox?