Browser Web Xulrunner 6.0.2

I'm trying to use the object "browser" (I use xulrunner 6.0.2)
Under the code used instead.

When I go to google.com I see an old page! does not appear, for
example, the "+you"

I think the problem is the prefs.js
can someone help me?

thanks

CODE XUL:

<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/
there.is.only.xul">
<hbox flex="1" width="100%" height="100%">
	<browser homepage="http://www.google.it" src="http://www.google.it"
type="content-primary" flex="1"/>
</hbox>
</window>