and <span class="code">nsfws://</span> URLs, and knows they are an
obfuscation of the relevant <span class="code">http://</span>
or <span class="code">https://</span> URL for URLs that are not
-work-safe.</p>
+work-safe. You can make your firefox understand <span
+class="code">nsfw://</span> URLS by visiting <a
+href="http://www.chiark.greenend.org.uk/~owend/nsfw.html">http://www.chiark.greenend.org.uk/~owend/nsfw.html</a>.</p>
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