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I am using http://www.mybrowserinfo.com/ to gather some info about me while browsing. I want to change my OS to appear that its a Windows Xp machine.(No VM solutions please:D)

If you have any related material how this sites fingerprint you please add it also.(same way as Nmap ? specifics in TCP/IP stack ?)

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I suspect it is looking at the user agent in your http request. Try setting the user agent in your HTTP request to Windows NT 5.1

Reference: http://msdn.microsoft.com/en-us/library/ms537503(v=vs.85).aspx

If you don't want to do this manually, there are a number of tools out there that will let you specify this point/click style.

Here is a good article that talks about how to start Chrome with a different default user agent: http://www.parmiter.com/applications/2012/02/RP773

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There are also options such as:
User Agent Switcher

Firefox Add-on:
https://addons.mozilla.org/En-us/firefox/addon/user-agent-switcher/

Chrome Extension:
(Also available, query for it, OP asked about Firefox, so priority)

This does NOT however change your native screen resolution, which is also typically passed.

So, for instance, if you are trying to tell a site that you "are" a Windows phone you can, but know that Google adwords, analytics, and anyone else who cares, leverage screen size resolution to aid in fingerprinting/marketing so it is nothing new.

Macbook Pro screens only come in a few sizes.

Check out what you are passing here:

http://www.whoishostingthis.com/tools/user-agent/

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