Why do some sites say my browser is out of date (v 3.6) when I am using Firefox 17.0.1 and am on the release update channel for automatic updates?

In Facebook and while trying to access an online support mechanism at HP, I receive messages telling me that my browser is out of date. The HP site identified my version as 3.6, when I am actually using version 17.0.1. At least when I click on Help, About Firefox, it tells me I am using v. 17.0.1. Why does this happen? On the HP site, I could not fill in the online registration info as I was receiving javascript errors, along with the browser outdate error.

Even your own analysis below, sees my browser as v. 3. What gives?

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