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Firefox alerts me that using 'version' 3.6.13 needs to be upgraded, but when I use 'free download' and restart Firefox I still end up with Firefox 3.6.13--what do I do to get the latest Firefox version?

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Responding to Firefox's prompt to upgrade my Firefox version 3.6.13, I use the "free download," select the "install changes," but still end up with 3.6.13. Why? How do I get the latest Firefox version that I need to use?

Responding to Firefox's prompt to upgrade my Firefox version 3.6.13, I use the "free download," select the "install changes," but still end up with 3.6.13. Why? How do I get the latest Firefox version that I need to use?

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Your UserAgent string in Firefox may be messed up by another program that you installed.
http://en.wikipedia.org/wiki/User_Agent

type about:config in the URL bar and hit Enter
If you see the warning, you can confirm that you want to access that page.
Filter = general.useragent.
Right-click the preferences that are bold, one line at a time, and select Reset.
Then restart Firefox