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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 email@example.com.
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,
I was displaying a large text link in place of the button, but the text link is gone now too. Hopefully, somebody will reboot the servers and get things back up and running. This seems to happen about every other month -- hopefully, this time, it won't be a several day outage.