Sunnz - 4:29 pm on Mar 25, 2008 (gmt 0)

Hi, first poster here I guess... hope my question isn't too n00bish.

I've been playing around with useragent string lately, because it seems to be the way of detecting user's browser/OS... but it can be very unreliable, as these can be changed very easily with modern web browsers.

But if you look at web sites like www.mozilla.com/firefox, it seems like they are not using the useragent string for OS detection! Today I have modify my useragent string to a non-existing OS and browser, and mozilla.com is still be to detect my real OS!

So I am wondering how did they do that? Is there some other techniques for OS detection? They are not using OS fingerprinting are they?

Thanks.