Tap here to go to the mobile version of the site.
Your Firefox is out of date and may contain a security risk! Upgrade Firefox

Support Forum

How do I tell if I have Firefox 32 bit or 64 bit?


I am trying to update my java add on, but I can not find ANYWHERE which version, 32 bit or 64 bit, of Firefox to know which one to install.

Additional System Details

This happened

Not sure how often

Installed Plug-ins

  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Next Generation Java Plug-in 1.6.0_29 for Mozilla browsers
  • Shockwave Flash 11.1 r102
  • iTunes Detector Plug-in
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • Google Update
  • GEPlugin
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.1
  • 4.0.60831.0
  • Adobe PDF Plug-In For Firefox and Netscape "9.4.5"
  • Adobe Shockwave for Director Netscape plug-in, version
  • Motive Plugin for Mozilla Browsers
  • Yahoo Application State Plugin version
  • npdnupdater2
  • npdnu


  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0.1) Gecko/20100101 Firefox/9.0.1

More Information

optional 19 solutions 64 answers

Helpful Reply

You appear to be running 32bit. Mozilla Firefox isn't currently offered in 64bit on Windows, aside from the Nightly testing releases.

Your User Agent (check it from Help -> Troubleshooting Information) does indicate which version you're running, in a roundabout way - WOW64 is what Windows calls running 32bit applications on 64bit Windows. If you were running 64bit Firefox, you would see x64 instead.