Send referers only when staying on the same domain. You can whitelist domains with wildcards and configure other things, look in the preferences page of the addon in the addon manager.This app doesn't have any features at the moment.
This extension can simplify the rule to just specify the URI and Content type and can enable/disable each rule separately.This app doesn't have any features at the moment.Discontinued
No longer updated. Last version, 0.3.7.9.18, released on January 31, 2013, was compatible with Firefox 18.