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Is my firefox 64 bit or 32 bit


That is all I want to know How do I find out if i have firefox 64 or 32 bit????????

Additional System Details

Installed Plug-ins

  • Shockwave Flash 11.4 r402
  • Next Generation Java Plug-in 1.6.0_35 for Mozilla browsers
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.4
  • MindSpark Toolbar Platform Plugin Stub for 32-bit Windows
  • Windows Presentation Foundation (WPF) plug-in for Mozilla browsers


  • User Agent: Mozilla/5.0 (Windows NT 6.0; WOW64; rv:15.0) Gecko/20100101 Firefox/15.0.1

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Your user agent in more system details on right of your post shows this.

Mozilla/5.0 (Windows NT 6.0; WOW64; rv:15.0) Gecko/20100101 Firefox/15.0.1

Note the WOW64 as this means it is a 32-bit app running on 64-bit Windows.

Mozilla does not have 64-bit Firefox releases for Windows yet while there has been 64-bit builds for Mac OSX and Linux since Firefox 4.0