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.

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