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Adds the referrering link from which a commenting user came from to comment notifications and Comments screen in the Admin panel of your site.

This is an extended version of Donncha's Comment Referrers plugin

ICS Comment Referrer:

• uses both server (HTTP Referer header) and client (works if JavaScript enabled) referrer identification;
• cryptographically protects the server-generated referrer field;
• adds referring links to comment notifications;
• shows referring links in Admin Panel » Comments.