make sure that the extension in question works with your version of Bugzilla.
Or, you can write your own extension. See the `Bugzilla Extension
-documentation <../html/api/Bugzilla/Extension.html>`_ for the core
-documentation on how to do that. It would make sense to read
+documentation <http://www.bugzilla.org/docs/tip/en/html/api/Bugzilla/Extension.html>`_
+for the core documentation on how to do that. It would make sense to read
the section on :ref:`templates`. There is also a sample extension in
:file:`$BUGZILLA_HOME/extensions/Example/` which gives examples of how to
use all the code hooks.