
Don’t know whether you’re using 32-bit or 64-bit of Firefox browser on your computer? You can easily find out that, all you need to do is check the user agent string of that browser.
Determine whether Firefox or Chrome you’re using is of 32-bit or 64-bit
I. For Firefox,
- Click on hamburger menu, open help menu and select ‘Troubleshooting information‘ or visit about:support page
- Under Application basics, look for User Agent string, if it contains Win64, you’re using 64-bit Firefox, if UA string doesn’t show Win64 and in place of it, if it shows, WOW64, if you’re using 32-bit.

READ: 64-bit Chrome for Windows is Now Available on Beta Channel
II. For Chrome
Type Chrome://version in page, check the UA.
64-bit Chrome UA