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No Referrer
A Firefox add-on that lets you check the referrers...
OpenURL Referrer
A Mozilla add-on that will insert OpenURL into results page....
converter convert conversion citation converter CitationtoURL
ReferrerHackKit
SIMBL plugin that will allow you to easily manage Safari's referrer...
manage customize manage referrer customize referrer referrer plugin
ReloadWithReferrer
Firefox add-on that globally stops sending referrer data....