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Your Firefox is out of date and may contain a security risk!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 can I find out if I'm running a 64-bit or 32-bit browser so I know what version of Java to download?


I am trying to determine what Firefox browser version I am running. I typed in about:support to find more info, but I couldn't find clearly where it says what version I'm running. I don't know what link to select to find out, but under "User Agent" it reads: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0

So I didn't know if the WOW64 referred to a 64-bit OS or not?

I would appreciate any help.

Thank you. Katya S.

Additional System Details


  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0

More Information

  • Top 25 Contributor
529 solutions 5045 answers

Helpful Reply

Your OS is 64 bit, firefox though is a 32 bit application.

  • Top 25 Contributor
  • Moderator
191 solutions 1966 answers

Helpful Reply

Just so you know, you need the 32-bit version of Java to work with 32-bit browsers like Firefox, regardless of the fact that your Windows OS is 64-bit.