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How do I determine which version of Firefox I currently am running?

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How do I determine which version of Firefox I am currently running on my laptop? I use Quickbooks Online and I keep getting a message that they will shortly discontinue supporting the version of Firefox that I have.

How do I determine which version of Firefox I am currently running on my laptop? I use Quickbooks Online and I keep getting a message that they will shortly discontinue supporting the version of Firefox that I have.

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Help > About Firefox

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.18) Gecko/20110614 Firefox/3.6.18 ( ) = 3.6.18 - but that ( ) doesn't belong there and Quickbooks Online might be misreading your UserAgent as a result of that ( ) being there.

Try resetting your UserAgent string.
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