-Microsoft gives a brief description of their filter's operation at
-`<http://blogs.msdn.com/ie/archive/2005/09/09/463204.aspx>`_. Firefox
-and Chrome both use Google's "safe browsing API" which is documented
-at `<http://code.google.com/apis/safebrowsing/>`_ and
-`<http://code.google.com/p/google-safe-browsing/wiki/Protocolv2Spec>`_.
+Microsoft gives `a brief description of their filter's operation`_. Firefox
+and Chrome both use Google's `"safe browsing API"`_ (`specification`_).