Referer Modifier lets you configure rules to decide what HTTP Referer header Firefox should send to a certain site, if any. For each target domain, one of five actions can be configured: Keep: Do not modify the RefererPrune: Send only the origin part of the Referer (scheme, host, and port)Target: Send the origin of the target URL (scheme, host, and port) as RefererRemove: Send no Referer at allRep