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jozko, referrals for Firefox with the Google Toolbar seem to still be available. [google.com...]
You may want to check with firstname.lastname@example.org.
In the meantime, I recommend clearing your cache and cookies and restarting your browser before viewing your page again, in case the issue is related to an client-side settings.
Also, the changes described in the blogpost apply only to AdSense referrals, not to referrals for Firefox or any other product.
Thanks for your patience,