Anyway, because it's something that can be seen as private information (which page you've visited before a given one), some browsers allow the user to disable the referrer information reporting (Firefox being one of them). I'm not sure what the default value is on Firefox, it would most likely be found in Edit/Preferences/Privacy & Security or Advanced.
i believe this is such an advanced feature that is avaliable only in about:config
considering how hidden is the option, probably is a safe assumption that if an user does not know what is it, probably is in the default state (ON, the user can vote)
-- nicu my OpenOffice.org pages: http://ooo.nicubunu.ro
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